Fix merge_method for mergify

[wolfogre]

The configuration uses the deprecated merge_method attribute of the queue action in one or more pull_request_rules. It > > must now be used under the queue_rules configuration.
A brownout is planned on September 16th, 2024.
This option will be removed on October 21st, 2024.
For more information: https://docs.mergify.com/configuration/file-format/#queue-rules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (949ba80) to head (e02851e).

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          118       118           
=========================================
  Hits           118       118           

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