ci: Update julia testing

[germa89]

Using last 2 julia versions

Description

Update CICD to use the last 2 julia versions
Skipping julia testing if not in certains specific events (PR, schedule, or dispatch).

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

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 84.21%. Comparing base (7c1eb1e) to head (6c6243f).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3211      +/-   ##
==========================================
- Coverage   86.63%   84.21%   -2.43%     
==========================================
  Files          52       53       +1     
  Lines        9550     9625      +75     
==========================================
- Hits         8274     8106     -168     
- Misses       1276     1519     +243