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 94.48%. Comparing base (9016348) to head (412f60c).
⚠️ Report is 80 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #523   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          31       31           
  Lines        3101     3101           
  Branches      173      173           
=======================================
  Hits         2930     2930           
  Misses        152      152           
  Partials       19       19           

Flag	Coverage Δ
unittests	94.48% <ø> (ø)

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