Prepare for 5.7.1 Release

[azeey]

🎈 Release

Preparation for 5.7.1 release.

Comparison to 5.7.0: gz-common5_5.7.0...gz-common5

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

All modified and coverable lines are covered by tests ✅

Project coverage is 80.59%. Comparing base (2d06bf7) to head (224749f).
Report is 35 commits behind head on gz-common5.

Additional details and impacted files

@@              Coverage Diff               @@
##           gz-common5     #662      +/-   ##
==============================================
- Coverage       83.65%   80.59%   -3.06%     
==============================================
  Files              90       93       +3     
  Lines           10273    13659    +3386     
==============================================
+ Hits             8594    11009    +2415     
- Misses           1679     2650     +971     

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