[8.x] Revert beats bump to unblock flag parsing bugfix

[carsonip]

Motivation/summary

Unblock 8.x backport of #14292 to fix #14280. Reverting beats instead of
bumping beats to avoid #14297.

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Related issues

[mergify]

This pull request is now in conflicts. Could you fix it @carsonip? 🙏
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 8.x-revert-beats-bump upstream/8.x-revert-beats-bump
git merge upstream/8.x
git push upstream 8.x-revert-beats-bump

[carsonip]

Superseded by #14309