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: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	1		0	0.0s
✅ REPOSITORY	gitleaks	yes		no	2.5s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	8.69s
✅ REPOSITORY	secretlint	yes		no	1.19s
✅ REPOSITORY	trivy-sbom	yes		no	0.11s
✅ REPOSITORY	trufflehog	yes		no	3.77s
⚠️ YAML	prettier	1		1	0.26s
✅ YAML	v8r	1		0	1.72s

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.72%. Comparing base (5a80a04) to head (1bebdfe).
Report is 139 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2547      +/-   ##
==========================================
+ Coverage   61.56%   68.72%   +7.15%     
==========================================
  Files          53       71      +18     
  Lines        9002    10918    +1916     
==========================================
+ Hits         5542     7503    +1961     
+ Misses       3020     2851     -169     
- Partials      440      564     +124     

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