REFACTOR: General code improvements

[SMoraisAnsys]

Changes include:

• use of defusedxml to safely parse an XML file;
• use of secrets to generate random values between 0 and 255;
• raise RuntimeError instead of using assert in code.

[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

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.36%. Comparing base (ea34abc) to head (8092703).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5378      +/-   ##
==========================================
- Coverage   84.36%   84.36%   -0.01%     
==========================================
  Files         140      140              
  Lines       58451    58459       +8     
==========================================
+ Hits        49312    49317       +5     
- Misses       9139     9142       +3     

[Samuelopez-ansys]

LGTM