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 94.98%. Comparing base (918463d) to head (8d66c2e).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #405   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files         139      139           
  Lines        1356     1356           
  Branches      265      265           
=======================================
  Hits         1288     1288           
  Misses         60       60           
  Partials        8        8           

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[farhaanbukhsh]

👍

• ✅ I tested this: Dependabot changes
• ✅ I read through the code
• ❌ I checked for accessibility issues
• ❌ Includes documentation
• ❌ I made sure any change in configuration variables is reflected in the corresponding client's configuration-secure repository.