Update dependency phpstan/phpstan-phpunit to v2 - autoclosed #2520

Job	Run time
PHPUnit tests (lowest, 8.2, ubuntu-latest)	16s
PHPUnit tests (lowest, 8.2, windows-latest)	17s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	16s
PHPUnit tests (lowest, 8.3, windows-latest)	13s
Test Compatibility (locked, 8.3, ubuntu-latest)	19s
PHPUnit tests (highest, 8.2, ubuntu-latest)	17s
Test Compatibility (locked, 8.3, windows-latest)	34s
PHPUnit tests (highest, 8.2, windows-latest)	20s
PHPUnit tests (highest, 8.3, ubuntu-latest)	18s
PHPUnit tests (highest, 8.3, windows-latest)	21s
Check Demo Scripts (locked, 8.3, ubuntu-latest)	11s
PHPUnit tests (locked, 8.2, ubuntu-latest)	13s
PHPUnit tests (locked, 8.2, windows-latest)	21s
PHPUnit tests (locked, 8.3, ubuntu-latest)	14s
Mutation tests (locked, 8.3, ubuntu-latest)	14s
PHPUnit tests (locked, 8.3, windows-latest)	17s
Static Analysis by PHPStan (locked, 8.2, ubuntu-latest)	19s
Static Analysis by Psalm (locked, 8.3, ubuntu-latest)	12s
Static Analysis by PHPStan (locked, 8.3, ubuntu-latest)	5s
Check Backward Compatibility (locked, 8.3, ubuntu-latest)	11s
Run benchmarks (locked, 8.3, ubuntu-latest)	11s
Run benchmarks (locked, 8.3, windows-latest)	35s
Check Coding Standards (locked, 8.2, ubuntu-latest)	21s
	6m 35s

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