Installing `gym[mujoco]` for the torchRL tutorial on Google Colab

[anirjoshi]

I am going through a tutorial here. It looks like gym[mujoco] is depreciated, and I get the following output on Google Colab on executing !pip3 install gym[mujoco]:

Building wheels for collected packages: mujoco
  error: subprocess-exited-with-error
  
  × python setup.py bdist_wheel did not run successfully.
  │ exit code: 1
  ╰─> See above for output.
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  Building wheel for mujoco (setup.py) ... error
  ERROR: Failed building wheel for mujoco
  Running setup.py clean for mujoco
Failed to build mujoco
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (mujoco)