[ mergify ] better implementation of 2 day delay

[ulysses4ever]

fix #8442

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• Patches conform to the coding conventions.
• Any changes that could be relevant to users have been recorded in the changelog.
• The documentation has been updated, if necessary.

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[Mikolaj]

Let's experiment!

[ulysses4ever]

Thanks everyone! Mergify can't handle updates to its config, so merging manually...