Backport boost 4.8.0 changes

[xavier-lc]

Proposed changes:

Backports changes for boost 4.8.0

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

N/a

Does this pull request change what data or activity we track or use?

No

Testing instructions:

Proofread changes.

🤖 Generated with Claude Code

https://claude.ai/code/session_019paijvVekTKTEucN8fxQ8x

[github-actions]

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Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

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