build: fix mergify

[prajjwol]

Closes: #ENG-444

Description

https://blog.mergify.com/strict-mode-deprecation/

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[linear]

ENG-444 Fix invalid Mergify configuration

Prevents running the Mergify GH action on CI

https://github.com/tharsis/evmos/pull/202/checks?check_run_id=4788661255

[fedekunze]

It says that the configuration is still invalid

[prajjwol]

@fedekunze I think it needs to make it to the master, it's complaining about extra keys not allowed @ pull_request_rules → item 0 → actions → merge → strict which I removed in this PR