Run static analysis with language level PHP 8.1 #9314
Merged
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Continuation of #9310
While PHP 7.1 is the lowest supported version, the repository contains features that require a more recent PHP version and we are currently hardly able to run static analysis on those parts.
Letting the static analysis tools operate on PHP 7.1 as language level causes unnecessary pain and barely spots real issues. Especially Psalm has a history of reporting funny errors if the dependencies are on a higher language level. I'd suggest to let the test suite cover PHP 7.1 support and let the SA tools operate on PHP 8.1 instead.