Prepare for 6.5.1 Release

[azeey]

🎈 Release

Preparation for 6.5.1 release.

Comparison to 6.5.0: gz-physics6_6.5.0...gz-physics6

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #552 (7788609) into gz-physics6 (80aaef1) will not change coverage.
The diff coverage is n/a.

❗ Current head 7788609 differs from pull request most recent head c7fbf42. Consider uploading reports for the commit c7fbf42 to get more accurate results

@@             Coverage Diff              @@
##           gz-physics6     #552   +/-   ##
============================================
  Coverage        75.83%   75.83%           
============================================
  Files              143      143           
  Lines             7325     7325           
============================================
  Hits              5555     5555           
  Misses            1770     1770