chore: enable github action auto update in dependabot.yml

[edx-requirements-bot]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.16%. Comparing base (1f0a0ee) to head (201f13f).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   94.16%   94.16%           
=======================================
  Files          68       68           
  Lines        1079     1079           
  Branches      295      295           
=======================================
  Hits         1016     1016           
  Misses         58       58           
  Partials        5        5           

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