Prepare for 9.2.0

[caguero]

🎈 Release

Preparation for 9.2.0 release.

Comparison to 9.2.0: gz-msgs9_9.1.0...bump_to_9.2.0

Needed by gazebosim/gz-sensors#290

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 #318 (f99762f) into gz-msgs9 (ad32258) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           gz-msgs9     #318   +/-   ##
=========================================
  Coverage     95.41%   95.41%           
=========================================
  Files            10       10           
  Lines          1026     1026           
=========================================
  Hits            979      979           
  Misses           47       47           

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