Prepare for 9.0.1 release

[caguero]

🎈 Release

Preparation for 9.0.1 release.

Comparison to 9.0.0: gz-gui9_9.0.0...gz-gui9

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 ✅

Please upload report for BASE (gz-gui9@14d04ab). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff             @@
##             gz-gui9     #655   +/-   ##
==========================================
  Coverage           ?   68.52%           
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  Files              ?       38           
  Lines              ?     5572           
  Branches           ?        0           
==========================================
  Hits               ?     3818           
  Misses             ?     1754           
  Partials           ?        0           

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