Fix package name

[azeey]

🦟 Bug fix

Summary

I accidentally left the package name as sdformat_mjcf_test while testing with test.pypi.org.

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[bot]]

Codecov Report

Merging #104 (f80af85) into main (9c5351a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   95.20%   95.20%           
=======================================
  Files          24       24           
  Lines        1168     1168           
=======================================
  Hits         1112     1112           
  Misses         56       56           

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