Prepare for 8.1.0 release

[nkoenig]

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

🎈 Release

Preparation for 8.1.0 release.

Comparison to 8.0.0: ignition-msgs8_8.0.0...ign-msgs8

Needed by gazebosim/gz-sim#1109

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):

Note to maintainers: Remember to use Squash-Merge

[codecov]

Codecov Report

Merging #198 (54938f2) into ign-msgs8 (16fb823) will not change coverage.
The diff coverage is n/a.

❗ Current head 54938f2 differs from pull request most recent head 3e2d714. Consider uploading reports for the commit 3e2d714 to get more accurate results

@@            Coverage Diff             @@
##           ign-msgs8     #198   +/-   ##
==========================================
  Coverage      84.56%   84.56%           
==========================================
  Files              7        7           
  Lines            855      855           
==========================================
  Hits             723      723           
  Misses           132      132           

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