13.0.0 release

[nkoenig]

Signed-off-by: Nate Koenig [email protected]

🎈 Release

Preparation for 13.0.0 release.

Changelog already done in #1139

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 #1169 (cde01e9) into sdf13 (26e380f) will not change coverage.
The diff coverage is n/a.

❗ Current head cde01e9 differs from pull request most recent head d895e8e. Consider uploading reports for the commit d895e8e to get more accurate results

@@           Coverage Diff           @@
##            sdf13    #1169   +/-   ##
=======================================
  Coverage   87.00%   87.00%           
=======================================
  Files         125      125           
  Lines       15834    15834           
=======================================
  Hits        13777    13777           
  Misses       2057     2057           

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