RegexArrayShapeMatcher: Don't narrow 'J' modifier #3723
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I think the 'J' modifier - which I have never seen in code until today - is something we don't need to support.
adding support is not impossible, but I don't want to overcomplicate the regex analysis for such an edge case.
this PR just makes sure we don't narrow it in a wrong way.
closes phpstan/phpstan#12126