Update dependency Microsoft.Data.SqlClient to v6

[dependencyupdates]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.Data.SqlClient (source)	5.2.3 -> 6.1.1

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Release Notes

dotnet/sqlclient (Microsoft.Data.SqlClient)

v6.1.1

This update includes the following changes since the 6.1.0 release:

Fixed

• Reverted changes related to improving partial packet detection, fixup, and replay functionality. This revert addresses regressions introduced in 6.1.0. (#​3556)
• Applied reference assembly corrections supporting vector, fixed JSON tests, and ensured related tests are enabled. #​3562
• Fixed SqlVector<T>.Null API signature in Reference assembly. #​3521

Changed

• Upgraded Azure.Identity and other dependencies to newer versions. (#​3538) (#​3552)

v6.1.0

This update brings the following changes since the
6.1.0-preview2 release:

Added

No new features were added.

Fixed

• Fixed missing socket error codes on non-Windows platforms.
  (#​3475)
• Fixed primary/secondary server SPN handling during SSPI negotiation.
  (#​3478)
• Fixed AzureKeyVaultProvider package key caching to serialize Azure key fetch
  operations.
  (#​3477)
• Fixed a rare error related to multi-packet async text reads.
  (#​3474)
• Fixed some spelling errors in the API docs.
  (#​3500)
• Fixed a rare multi-packet string corruption bug.
  (#​3513)

Changed

SqlDecimal type workarounds conversions

What Changed:

• Changed how SqlDecimal type workarounds perform conversions to meet
  compliance policies.
  (#​3467)

Who Benefits:

• Microsoft products must not use undocumented APIs on other Microsoft products.
  This change removes calls to undocumented APIs and replaces them with
  compliant API use.

Impact:

• These changes impose an observed 5% decrease in performance on .NET Framework.

SqlVector API improvements

What Changed:

• Several changes were made to the SqlVector API published in the
  6.1.0-preview2 release
  (#​3472):
  • The SqlVector class was changed to a readonly struct.
  • The null value constructor was changed to a static CreateNull() method.
  • The Size property was removed.

Who Benefits:

• SqlVector instances gain the efficiencies of struct handling.

Impact:

• Early-adopter applications may require updates if they rely on the old APIs
  and any class-specific behaviour.

v6.0.2

This update brings the following changes since the
6.1.0-preview1 release:

Added

Added dedicated SQL Server vector datatype support

What Changed:

• Optimized vector communications between MDS and SQL Server 2025, employing a
  custom binary format over the TDS protocol.
  (#​3433,
  #​3443)
• Reduced processing load compared to existing JSON-based vector support.
• Initial support for 32-bit single-precision floating point vectors.

Who Benefits:

• Applications moving large vector data sets will see beneficial improvements
  to processing times and memory requirements.
• Vector-specific APIs are ready to support future numeric representations with
  a consistent look-and-feel.

Impact:

• Reduced transmission and processing times for vector operations versus JSON
  using SQL Server 2025 preview:
  • Reads: 50x improvement
  • Writes: 3.3x improvement
  • Bulk Copy: 19x improvement
  • (Observed with vector column of max 1998 size, and 10,000 records for each
    operation.)
• Improved memory footprint due to the elimination of JSON
  serialization/deserialization and string representation bloat.
• For backwards compatibility with earlier SQL Server Vector implementations,
  applications may continue to use JSON strings to send/receive vector data,
  although they will not see any of the performance improvements noted above.

Revived .NET Standard 2.0 target support

What Changed:

• Support for targeting .NET Standard 2.0 has returned.
  (#​3381)
• Support had previously been removed in the 6.0 release, with the
  community voicing concerns.

Who Benefits:

• Libraries that depend on MDS may seamlessly target any of the following
  frameworks:
  • .NET Standard 2.0
  • .NET Framework 4.6.2 and above
  • .NET 8.0
  • .NET 9.0
• Applications should continue to target runtimes.
  • The MDS .NET Standard 2.0 target framework support does not include an
    actual implementation, and cannot be used with a runtime.
  • An application's build/publish process should always pick the appropriate
    MDS .NET/.NET Framework runtime implementation.
  • Custom build/publish actions that incorrectly try to deploy the MDS .NET
    Standard 2.0 reference DLL at runtime are not supported.

Impact:

• Libraries targeting .NET Standard 2.0 will no longer receive warnings like
  this:
  • warning NU1701: Package 'Microsoft.Data.SqlClient 6.0.2' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework '.NETStandard,Version=v2.0'. This package may not be fully compatible with your project.

Fixed

• Fixed missing <NeutralLanguage> property.
  (#​3325)
• Fixed injection of UTF-8 BOM during bulk copy.
  (#​3399)
• Fixed SqlCachedBuffer async read edge case.
  (#​3329)
• Fixed SqlSequentialTextReader edge case with single-byte reads.
  (#​3383)
• Fixed an incorrect error message when parsing connection string PoolBlockingPeriod.
  (#​3411)
• Added missing ToString() override to SqlJson.
  (#​3427)

Changed

• Reduced allocations when opening a connection.
  (#​3364)
• Various performance improvements related to TDS parsing.
  (#​3337,
  #​3377,
  #​3422)
• Improved native AOT support.
  (#​3364,
  #​3369,
  #​3401)
• Progress towards SSPI extensibility.
  (#​2454)
• Progress towards connection pooling improvements.
  (#​3352,
  #​3396)
• Expanded/clarified SqlConnection's
  AccessToken and
  AccessTokenCallback
  documentation.
  (#​3339)
• Fixed some poorly formatted tables in the API docs.
  (#​3391)
• Code merge towards a unified SqlClient project, aligning .NET Framework and
  .NET Core implementations.
  (#​3262,
  #​3291,
  #​3305,
  #​3306,
  #​3310,
  #​3323,
  #​3326,
  #​3335,
  #​3338,
  #​3340,
  #​3341,
  #​3343,
  #​3345,
  #​3353,
  #​3355,
  #​3368,
  #​3373,
  #​3376,
  #​3388,
  #​3389,
  #​3393,
  #​3405,
  #​3414,
  #​3416,
  #​3417,
  #​3420,
  #​3431,
  #​3438)
• Test improvements include a new unit test project, updates to test
  dependencies, removal of hardcoded credentials, and improved robustness.
  (#​3204,
  #​3379,
  #​3380,)
  #​3402
• Added dependency on System.Text.Json
  8.0.5 (.NET 8.0) and
  9.0.5 (.NET Standard 2.0, .NET 9.0)
  to avoid transitive vulnerabilities (CVE-2024-43485).
  (#​3403)

v6.0.1

This update brings the below changes over the previous release:

Fixed

• Fixed reference assembly definitions for SqlClientDiagnostic APIs #​3097
• Fixed issue with down-level SSL/TLS version warnings #​3126

Changed

• Dependency changes
  • Updated SNI dependency Microsoft.Data.SqlClient.SNI and Microsoft.Data.SqlClient.SNI.runtime to 6.0.2 #​3116 #​3117

v6.0.0

No changes since the last preview release

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