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.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ YAML	prettier	1	0	0	0.41s
✅ YAML	v8r	1		0	1.26s
✅ YAML	yamllint	1		0	0.29s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.18%. Comparing base (67c62da) to head (853970a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1259   +/-   ##
=======================================
  Coverage   81.17%   81.18%           
=======================================
  Files         200      200           
  Lines       21971    21971           
  Branches     3482     3482           
=======================================
+ Hits        17836    17838    +2     
- Misses       2984     2986    +2     
+ Partials     1151     1147    -4     

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