Changelog for 9.2.1

[ebeahan]

Change for upcoming 9.2.1 release.

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b changelog-9.2.1 upstream/changelog-9.2.1
git merge upstream/9.2
git push upstream changelog-9.2.1