Fixes #18733: Add Dependency Version Matrix for NetBox Versions to the Upgrade Documentation

[pheus]

Fixes: #18733

Summary

This PR introduces a dependency version matrix to the Upgrade Guide, providing a structured reference for verifying compatibility before upgrading. The matrix outlines the supported versions of Python, PostgreSQL, and Redis for each NetBox release, helping users avoid installation issues due to unsupported dependencies.

Changes

• Added a toggleable version matrix to the upgrade guide, allowing users to switch between Current Version and All Versions instead of the initially proposed Current Version and Previous Versions. This makes it clearer and more useful for users looking for historical compatibility data.
• Ensures that system requirements for each NetBox version are clearly documented in one place.

Screenshots

Would love any feedback on placement or formatting! 🚀

[pheus]

I'd like to point out that I targeted the main branch. If this PR gets merged into the feature branch instead, we should consider #18909, as that PR raises the minimum PostgreSQL version to 14.

Looking forward to your feedback, @jnovinger!

[jeremystretch]

The documentation for cutting a new minor release should also be updated with instructions for updating the matrix.

[pheus]

Thanks for the feedback, @jeremystretch! That makes sense. I'll update the documentation for cutting a new minor release to include instructions for maintaining the matrix.

[pheus]

I've added instructions for updating the dependency requirements matrix to the release documentation. Let me know if any refinements are needed!
In the third commit, I made some smaller adjustments - if you don't find them useful, feel free to drop that commit.