Prepare for 6.2.0 release

[mjcarroll]

🎈 Release

Preparation for 6.2.0 release.

Comparison to 6.1.1: gz-physics6_6.1.1...gz-physics6

Needed by gazebosim/gz-sim#1592

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

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.

[codecov]

Codecov Report

Merging #453 (d097321) into gz-physics6 (86d5a0f) will not change coverage.
The diff coverage is n/a.

❗ Current head d097321 differs from pull request most recent head 4738bed. Consider uploading reports for the commit 4738bed to get more accurate results

@@             Coverage Diff              @@
##           gz-physics6     #453   +/-   ##
============================================
  Coverage        75.79%   75.79%           
============================================
  Files              140      140           
  Lines             7056     7056           
============================================
  Hits              5348     5348           
  Misses            1708     1708           

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