python support 3.12 and remove pyansys-docker fork requirement

[mariostieriansys]

The PR does three things:

1. Remove support to 3.8 and add support to 3.12
2. Remove the need for the pyansys-docker fork, now the docker module works (tests are passing!). The fork was having issues since the code contains calls to distutils, removed from 3.12
3. I started seeing vale errors against string like ":func:`attrinfo<ansys.api.pyensight.ens_annot.ENS_ANNOT.attrinfo>", where the code style check was complaining that after "E" a space was required. This is of course not an issue being this a reference to an area of our docs; so I modifed the .vale.ini configuration file to ignore :func: and :samp: blocks

[codecov-commenter]

Codecov Report

Merging #323 (5d3432b) into main (90d0626) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #323   +/-   ##
=======================================
  Coverage   81.08%   81.08%           
=======================================
  Files          18       18           
  Lines        2500     2500           
  Branches      437      437           
=======================================
  Hits         2027     2027           
  Misses        319      319           
  Partials      154      154           

Files	Coverage Δ
src/ansys/pyensight/core/dockerlauncher.py	81.04% <100.00%> (ø)

[mariostieriansys]

@margalva I was getting issues on using our docker module fork against Python 3.12, since it uses distutils which has been removed from 3.12

I have found that the standard docker module is now working correctly for us, and so in this PR I have removed the dependency on the fork. You may be interested in checking and doing the same