Depend on python3-yaml instead of python-yaml

[chapulina]

🦟 Bug fix

Summary

Jammy doesn't have python-yaml. If python3-yaml works with Bionic and Focal, we should use that.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[codecov]

Codecov Report

Merging #153 (c07a135) into ign-launch5 (7dbac66) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           ign-launch5     #153   +/-   ##
============================================
  Coverage        32.92%   32.92%           
============================================
  Files                4        4           
  Lines              817      817           
============================================
  Hits               269      269           
  Misses             548      548           

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