CI: This and that

[amotl]

• CI: Update to codecov-action@v5
• CI: Verify on Python 3.13
• CI: Run Dependabot checks on a daily schedule

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.54%. Comparing base (6214a57) to head (600a60d).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #122   +/-   ##
=======================================
  Coverage   99.53%   99.54%           
=======================================
  Files          18       18           
  Lines         432      435    +3     
=======================================
+ Hits          430      433    +3     
  Misses          2        2           

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