chore[ci]: enable merge groups

[charles-cooper]

this commit enables merge groups, so that we can take advantage of github's merge queue functionality.

references:

• https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue
• https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/merging-a-pull-request-with-a-merge-queue

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.40%. Comparing base (b43ffac) to head (63f0139).

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3931       +/-   ##
===========================================
- Coverage   90.94%   67.40%   -23.54%     
===========================================
  Files          95       95               
  Lines       14397    14397               
  Branches     3191     3191               
===========================================
- Hits        13093     9705     -3388     
- Misses        904     4024     +3120     
- Partials      400      668      +268     

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