Update CI badges in README

[iche033]

🦟 Bug fix

Summary

focal -> jammy
ign -> gz
main -> utils2

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• 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

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

All modified and coverable lines are covered by tests ✅

Comparison is base (9e80552) 80.89% compared to head (a48a7f9) 80.89%.

Additional details and impacted files

@@            Coverage Diff             @@
##           gz-utils2     #120   +/-   ##
==========================================
  Coverage      80.89%   80.89%           
==========================================
  Files              8        8           
  Lines            382      382           
==========================================
  Hits             309      309           
  Misses            73       73           

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