Prepare for 6.0.0 release

[iche033]

Signed-off-by: Ian Chen [email protected]

🎈 Release

Preparation for 6.0.0 release.

Comparison to 5: ign-sensors5...ign-sensors6

gazebo-tooling/release-tools#459

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 #161 (cf2802b) into ign-sensors6 (1d92937) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           ign-sensors6     #161   +/-   ##
=============================================
  Coverage         75.90%   75.90%           
=============================================
  Files                27       27           
  Lines              2747     2747           
=============================================
  Hits               2085     2085           
  Misses              662      662           

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