Bump Polyfill from 6.14.0 to 7.0.0 in /src

Bumps [Polyfill](https://github.com/SimonCropp/Polyfill) from 6.14.0 to 7.0.0.
- [Commits](SimonCropp/Polyfill@6.14.0...7.0.0)

---
updated-dependencies:
- dependency-name: Polyfill
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -7,7 +7,7 @@
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageVersion Include="NServiceBus" Version="9.2.2" />
-    <PackageVersion Include="Polyfill" Version="6.14.0" />
+    <PackageVersion Include="Polyfill" Version="7.0.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.139" />
     <PackageVersion Include="Verify" Version="27.0.0-beta.6" />
     <PackageVersion Include="Verify.DiffPlex" Version="3.1.0" />