Add cargo audit workflow

[utpilla]

Fixes #
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.3%. Comparing base (10cf02c) to head (2eb34e8).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2930   +/-   ##
=====================================
  Coverage   81.3%   81.3%           
=====================================
  Files        126     126           
  Lines      24254   24254           
=====================================
+ Hits       19736   19737    +1     
+ Misses      4518    4517    -1     

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