ci(mergify): upgrade configuration to current format

[mergify]

No more deprecated fields are being used in your Mergify configuration, this pull request will be closed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.52%. Comparing base (3ceeab0) to head (20b543c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #391   +/-   ##
=======================================
  Coverage   55.52%   55.52%           
=======================================
  Files          27       27           
  Lines         787      787           
=======================================
  Hits          437      437           
  Misses        334      334           
  Partials       16       16           

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