user_guide/ python-3.12 no longer includes distutils

Closed Jens Petersen requested to merge juhp/ghc:python-distutils into master

distutils was officially deprecated in python-3.10 and has been removed with the release of python-3.12. So currently the user_guide cannot be built with python-3.12 sphinx. This change just fixes not to use distutils.version but instead the modern packaging.version replacement module.

See for more background

I have tested and applied this patch to ghc-9.6.2 on current Fedora Rawhide (which includes python-3.12) and also tried it on Centos Stream 9 which has python 3.9.

Edited by Jens Petersen

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