12.6.0 release

[nkoenig]

Signed-off-by: Nate Koenig nate@openrobotics.org

🎈 Release

Preparation for 12.6.0 release.

Comparison to 12.5.0: sdformat12_12.5.0...sdf12

Needed by gazebosim/gz-sim#1739

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 #1174 (2c170bc) into sdf12 (f3cdd07) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            sdf12    #1174   +/-   ##
=======================================
  Coverage   91.69%   91.69%           
=======================================
  Files          80       80           
  Lines       13079    13079           
=======================================
  Hits        11993    11993           
  Misses       1086     1086           

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