Add MuJoCo Humanoid MJCF description (and deepmind/mujoco to repository list)

[ManifoldFR]

[coveralls]

Pull Request Test Coverage Report for Build 16294000035

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 98.105%

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Totals
Change from base Build 16225601439:	0.009%
Covered Lines:	1191
Relevant Lines:	1214

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💛 - Coveralls

[stephane-caron]

Thank you for adding this MJCF description 👍

There is one linter error:

   +++ /home/runner/work/robot_descriptions.py/robot_descriptions.py/robot_descriptions/_repositories.py	2025-07-15 12:57:06.084350+00:00
  @@ -204,11 +204,11 @@
           cache_path="mujoco_menagerie",
       ),
       "mujoco": Repository(
           url="https://github.com/google-deepmind/mujoco.git",
           commit="ad0dc0de5e10a075a2c65be629e9a8d557d383a6",
  -        cache_path="mujoco"
  +        cache_path="mujoco",
       ),
       "nao_robot": Repository(
           url="https://github.com/ros-naoqi/nao_robot.git",
           commit="67476469a1371b00b17538eb6ea336367ece7d44",
           cache_path="nao_robot",
  would reformat /home/runner/work/robot_descriptions.py/robot_descriptions.py/robot_descriptions/_repositories.py