[8.x] changelog: add entry for 8.16.2 release notes (backport #14912) #14974
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Motivation/summary
Prepare release notes for 8.16.2 release, not to merge just yet.
Checklist
For functional changes, consider:
How to test these changes
Related issues
This is an automatic backport of pull request #14912 done by [Mergify](https://mergify.com).