fix: Improve PHP 8.1 compatibility by disabling deprecation notices #4746
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Closes #4554
I honestly have no idea how to reliably test this, but what I did was open the project in PHPStorm, set the language level to PHP 8.1, and run the Class Hierarchy Checks inspection.
See https://php.watch/versions/8.1/internal-method-return-types#ReturnTypeWillChange
PS: This will probably not survive PHP 8.2 😅