build: temporary avoid flit latest version

[SMoraisAnsys]

Description

Temporary avoid using the latest version of flit due to issues when releasing to PyPI with https://github.com/pypa/gh-action-pypi-publish. The problem comes from the new metadata format used to release and the fact the version of pypa/gh-action-pypi-publish we are using is not compatible with is. However, using a newer version is a problem, see ansys/actions#687 for more information on the blocking changes.

Issue linked

None

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

[ansys-reviewer-bot]

Thanks for opening a Pull Request. If you want to perform a review write a comment saying:

@ansys-reviewer-bot review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.35%. Comparing base (99a4b96) to head (526cfbe).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3771      +/-   ##
==========================================
- Coverage   88.40%   88.35%   -0.05%     
==========================================
  Files         187      187              
  Lines       14717    14717              
==========================================
- Hits        13010    13003       -7     
- Misses       1707     1714       +7     

[SMoraisAnsys]

@germa89 I don't think the current error (see below) is related to my changes, any idea of why this would have appeared ?

[FAILED] TestMapdlPool.test_directory_names_function - E AssertionError: assert 'Other_instance' in ['instance_zero', 'instance_one']

[germa89]

Thank you @SMoraisAnsys for this PR! It comes in the right hour!

@germa89 I don't think the current error (see below) is related to my changes, any idea of why this would have appeared?

That is a typical flaky test in PyMAPDL. I have a branch that aims to fix it but for the moment, I will just rerun/merge this :)