fix: raising port busy when connecting

[germa89]

Description

The following

from ansys.mapdl.core import launch_mapdl

mapdl = launch_mapdl(start_instance=False, port=50053)

was giving the error PortInUse.

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)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.34%. Comparing base (e8248a3) to head (3d1d619).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3507      +/-   ##
==========================================
+ Coverage   82.33%   82.34%   +0.01%     
==========================================
  Files          57       57              
  Lines       10007    10004       -3     
==========================================
- Hits         8239     8238       -1     
+ Misses       1768     1766       -2     

[germa89]

@pyansys-ci-bot LGTM.

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬