Bump version to 0.1.1

[azeey]

🎈 Release

Preparation for 0.1.1 release.

Comparison to 0.1.0: https://github.com/gazebosim/gz-mujoco/compare/v0.1.0...main

Checklist

• [x] Asked team if this is a good time for a release ~- [] There are no changes to be ported from the previous major version~ ~- [ ] No PRs targeted at this major version are close to getting in~
• [x] Bumped minor for new features, patch for bug fixes ~- [ ] Updated changelog~ ~- [ ] Updated migration guide (as needed)~ ~- [ ] Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed): ~

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 #113 (7da0164) into main (fbb82a9) will not change coverage. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #113   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files          24       24           
  Lines        1171     1171           
=======================================
  Hits         1116     1116           
  Misses         55       55           

Impacted Files	Coverage Δ
sdformat_mjcf/src/sdformat_mjcf/__version__.py	0.00% <0.00%> (ø)

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