🎈 6.8.0~pre3

[chapulina]

🎈 Release

Preparation for 6.8.0~pre3 release.

Comparison to 6.8.0~pre2: ignition-math6_6.8.0-pre2...ign-math6

Needed by gazebosim/gz-physics#223

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 #199 (5706506) into ign-math6 (1610d5a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-math6     #199   +/-   ##
==========================================
  Coverage      99.21%   99.21%           
==========================================
  Files             65       65           
  Lines           6087     6087           
==========================================
  Hits            6039     6039           
  Misses            48       48           

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