Update CI badges in README

[iche033]

🦟 Bug fix

Summary

updated links: ign - > gz

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 (abca8da) 72.78% compared to head (d1c9b93) 72.78%.

Additional details and impacted files

@@             Coverage Diff              @@
##           gz-sensors8     #405   +/-   ##
============================================
  Coverage        72.78%   72.78%           
============================================
  Files               36       36           
  Lines             4972     4972           
============================================
  Hits              3619     3619           
  Misses            1353     1353           

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