🎈 6.9.0~pre1

[chapulina]

🎈 Release

Preparation for 6.9.0~pre1 release.

Comparison to 6.8.0: ignition-math6_6.8.0...ign-math6

gazebo-tooling/release-tools#421

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 #245 (811b4f4) into ign-math6 (274378c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-math6     #245   +/-   ##
==========================================
  Coverage      99.41%   99.41%           
==========================================
  Files             67       67           
  Lines           6347     6347           
==========================================
  Hits            6310     6310           
  Misses            37       37           

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