🎈 3.2.1

[mjcarroll]

🎈 Release

Preparation for 3.2.1 release.

Comparison to 3.2.0: https://github.com/gazebosim/gz-cmake/compare/gz-cmake3_3.2.0...gz-cmake3

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.

[mjcarroll]

Homebrew job is an infra issue.