Support is broken for Python 3.12

[willdunklin]

pip installing this package fails when using python3.12:

$ python3.12 -m pip install singularity-compose
Defaulting to user installation because normal site-packages is not writeable
Collecting singularity-compose
  Downloading singularity-compose-0.1.18.tar.gz (32 kB)
  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: Can not execute `setup.py` since setuptools is not available in the build environment.
      [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.

When using 3.8, the install succeeds:

$ python3.8 -m pip install singularity-compose
Defaulting to user installation because normal site-packages is not writeable
Collecting singularity-compose
  Using cached singularity-compose-0.1.18.tar.gz (32 kB)
  Preparing metadata (setup.py) ... done
Collecting spython>=0.2.11 (from singularity-compose)
  Downloading spython-0.3.13-py3-none-any.whl.metadata (8.6 kB)
Collecting pyaml>=5.1.1 (from singularity-compose)
  Downloading pyaml-23.12.0-py3-none-any.whl.metadata (11 kB)
Requirement already satisfied: PyYAML in ./.local/lib/python3.8/site-packages (from pyaml>=5.1.1->singularity-compose) (6.0)
Downloading pyaml-23.12.0-py3-none-any.whl (23 kB)
Downloading spython-0.3.13-py3-none-any.whl (109 kB)
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 109.6/109.6 kB 1.8 MB/s eta 0:00:00
Building wheels for collected packages: singularity-compose
  Building wheel for singularity-compose (setup.py) ... done
  Created wheel for singularity-compose: filename=singularity_compose-0.1.18-py3-none-any.whl size=48182 sha256=5eb3662aaf3638dc298f9781a8f8cbd034dd5bdab3ba853cf746d0c36cdb6e4e
  Stored in directory: ~/.cache/pip/wheels/be/d9/19/ef8619972db1a384098dc9792e7bd97f7f34b1ca55c52cc07a
Successfully built singularity-compose
Installing collected packages: spython, pyaml, singularity-compose
Successfully installed pyaml-23.12.0 singularity-compose-0.1.18 spython-0.3.13

@vsoch
If you could either update your python packaging to be compliant with python3.12 or explicitly mention which versions are supported, it would be much appreciated. Thank you!

[vsoch]

Could you please test build and install of a wheel directly? I can release that alongside if needed. Otherwise, please make a specific suggestion for what you'd like changed. Thanks!