Prepare for 3.5.3 Release

[azeey]

🎈 Release

Preparation for 3.5.3 release.

Comparison to 3.5.2: https://github.com/gazebosim/gz-cmake/compare/gz-cmake3_3.5.2...gz-cmake3

Needed by <PR(s)>

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.

[scpeters]

the package.xml version-checking CI works! I updated the package.xml version in https://github.com/gazebosim/gz-cmake/pull/426/commits/a935e152f22211f0caf33ffb601e91b7ba5b0acb