Update dependency phpstan/phpstan-phpunit to v2 #2513

Job	Run time
Static Analysis by PHPStan (locked, 8.2, ubuntu-latest)	12s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	1s
Static Analysis by PHPStan (locked, 8.3, ubuntu-latest)	11s
PHPUnit tests (lowest, 8.2, windows-latest)	10s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	13s
Mutation tests (locked, 8.3, ubuntu-latest)	14s
PHPUnit tests (lowest, 8.3, windows-latest)	10s
PHPUnit tests (highest, 8.2, ubuntu-latest)	24s
Static Analysis by Psalm (locked, 8.3, ubuntu-latest)	15s
PHPUnit tests (highest, 8.2, windows-latest)	15s
Run benchmarks (locked, 8.3, ubuntu-latest)	14s
PHPUnit tests (highest, 8.3, ubuntu-latest)	24s
Run benchmarks (locked, 8.3, windows-latest)	11s
PHPUnit tests (highest, 8.3, windows-latest)	13s
PHPUnit tests (locked, 8.2, ubuntu-latest)	19s
Check Coding Standards (locked, 8.2, ubuntu-latest)	11s
PHPUnit tests (locked, 8.2, windows-latest)	11s
Test Compatibility (locked, 8.3, ubuntu-latest)	13s
PHPUnit tests (locked, 8.3, ubuntu-latest)	12s
PHPUnit tests (locked, 8.3, windows-latest)	11s
Test Compatibility (locked, 8.3, windows-latest)	1s
Check Demo Scripts (locked, 8.3, ubuntu-latest)	18s
Check Backward Compatibility	0s
	4m 43s

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