tests: Add security audit.

[ggorman]

Integrate security scanning tools—pip-audit, Bandit, and Trivy—into the GitHub Actions workflow

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[mloubout]

need to do all the requirements-*.txt to check the mpi/optional/nvidia ones too

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.99%. Comparing base (afdc230) to head (45fc168).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2569      +/-   ##
==========================================
- Coverage   92.00%   91.99%   -0.01%     
==========================================
  Files         244      244              
  Lines       47760    47760              
  Branches     4199     4199              
==========================================
- Hits        43940    43937       -3     
- Misses       3149     3150       +1     
- Partials      671      673       +2     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	72.60% <ø> (ø)
pytest-gpu-nvc-nvidiaX	73.68% <ø> (ø)

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