Migrate from Sonatype OSS Index to Sonatype Guide API

[danielcompton]

Is your feature request related to a problem? Please describe.

I got an email that Sonatype is migrating OSS Index to Sonatype Guide. The OSS Index API will move to a compatibility API within Guide, with migration instructions going out March 31, 2026.

Dependency-Check uses the OSS Index analyzer as a vulnerability data source, so this will need updating at some point.

Describe the solution you'd like

Unsure

Describe alternatives you've considered

• Do nothing and hope the compatibility API works without changes (unclear if endpoints or auth will change)
• Drop OSS Index analyzer and rely solely on NVD

Additional context

From Sonatype's announcement:

The OSS Index API will continue to be available via compatibility API in Sonatype Guide. Users can expect continued compatibility with existing integrations such as Dependency-Track and Dependency-Check.

Announcement: https://www.sonatype.com/products/sonatype-guide/oss-index-users

[nhumblot]

Relates to #8335