Issue when pip installing acc-app-optimisation in the virtual network

There is a bug when installing the deprecated gym package in the Technical Machine (virtual machine for CCC).

See also this commit from Francesco Velotti on another package: abt-optics-and-code-repository/commissioning-tools/cern-general-devices@c1695078

In the setup.py this line should be changed

"box2d": ["box2d-py==2.3.5", "pygame==2.1.0", "swig==4.*"],

to this

"box2d": ["box2d-py==2.3.5", "pygame==2.1.0", "swig==4.0"],

Error message:

Collecting gym>=0.17
  Using cached http://acc-py-repo.cern.ch/repository/py-thirdparty-remote/packages/gym/0.21.0/gym-0.21.0.tar.gz (1.5 MB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  ? exit code: 1
  ??> [1 lines of output]
      error in gym setup command: 'extras_require' must be a dictionary whose values are strings or lists of strings containing valid project/version requirement specifiers.
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
??> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.