Restore nightly audit

[awharn]

What It Does

Allows the main branch audit badge to work by enabling nightly audit runs

How to Test

Review Checklist I certify that I have:

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

Additional Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.28%. Comparing base (ec83f9d) to head (5981a58).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #138 +/- ## ======================================= Coverage 93.28% 93.28% ======================================= Files 74 74 Lines 760 760 Branches 94 93 -1 ======================================= Hits 709 709 Misses 51 51 ```

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