Add 3.13 to Python version matrix and fix audit workflow

[t1m0thyj]

What It Does

How to Test

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

Additional Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.10%. Comparing base (3a32dee) to head (7df6861).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #338      +/-   ##
==========================================
+ Coverage   89.07%   89.10%   +0.03%     
==========================================
  Files          65       65              
  Lines        3249     3258       +9     
==========================================
+ Hits         2894     2903       +9     
  Misses        355      355              

Flag	Coverage Δ
unittests	89.10% <100.00%> (+0.03%)	⬆️

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[traeok]

LGTM, thanks Timothy

[zFernand0]

LGTM! 😋
should we drop 3.8 since it's not receiving security fixes (I believe)?

Unsupported version

• https://devguide.python.org/versions/#unsupported-versions