🎈 3.9.0

[chapulina]

🎈 Release

Preparation for the 3.9.0 release.

The second pre-release was made in #967 and everything looks ok to me.

Comparison to 3.8.0: ignition-gazebo3_3.8.0...ign-gazebo3

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 ignition-release (as needed): Done during pre-release

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #976 (a95a681) into ign-gazebo3 (d468c05) will increase coverage by 0.05%.
The diff coverage is n/a.

❗ Current head a95a681 differs from pull request most recent head d163814. Consider uploading reports for the commit d163814 to get more accurate results

@@               Coverage Diff               @@
##           ign-gazebo3     #976      +/-   ##
===============================================
+ Coverage        77.84%   77.89%   +0.05%     
===============================================
  Files              221      221              
  Lines            12687    12687              
===============================================
+ Hits              9876     9883       +7     
+ Misses            2811     2804       -7     

Impacted Files	Coverage Δ
src/gui/plugins/shapes/Shapes.cc	31.25% <0.00%> (ø)
src/gui/plugins/plot_3d/Plot3D.cc	47.82% <0.00%> (+4.34%)	⬆️

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