fix: adding on-call reminders to every Wednesday

[abanuelo]

Description

0 is Sunday when I assumed 0 as Monday. Updating the on-call reminder to fire on Wednesday mornings when on-call rotations are meant to be handed off!

Issue Link

Checklist

• [X] I have tested the changes locally via pytest and/or other means
• [ ] I have added or updated relevant documentation
• [ ] I have autoformatted the code with black and isort
• [ ] I have added test cases (if applicable)

Additional Notes

[codecov[bot]]

Codecov Report

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

Project coverage is 86.14%. Comparing base (01af6b1) to head (e8d2bfa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #258 +/- ## ========================================== - Coverage 86.16% 86.14% -0.02% ========================================== Files 144 144 Lines 25007 25007 ========================================== - Hits 21547 21543 -4 - Misses 3460 3464 +4 ```

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