docs: pin Latest News links to commit IDs

[bvandermoon]

Description

Pinned several main branch links in the "Latest News" section to specific commit IDs. This prevents links from breaking if files are relocated in the future.

Tests

Verified that the commit IDs are valid and the referenced files exist at those locations.

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.