Update CI badges in README

[iche033]

🦟 Bug fix

Summary

focal -> jammy ign -> gz

Checklist

• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6c4b1ec) 87.78% compared to head (744ef6e) 87.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## gz-transport13 #465 +/- ## ================================================== + Coverage 87.78% 87.82% +0.03% ================================================== Files 59 59 Lines 5699 5699 ================================================== + Hits 5003 5005 +2 + Misses 696 694 -2 ```

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