Update dependency phpstan/phpstan to ^1.11.5 #2248

Job	Run time
Check Backward Compatibility (locked, 8.3, ubuntu-latest)	21s
Run benchmarks (locked, 8.3, ubuntu-latest)	12s
Check Coding Standards (locked, 8.2, ubuntu-latest)	23s
Run benchmarks (locked, 8.3, windows-latest)	53s
Test Compatibility (locked, 8.3, ubuntu-latest)	14s
Test Compatibility (locked, 8.3, windows-latest)	49s
Mutation tests (locked, 8.3, ubuntu-latest)	15m 50s
Check Demo Scripts (locked, 8.3, ubuntu-latest)	10s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	1m 20s
Static Analysis by PHPStan (locked, 8.2, ubuntu-latest)	31s
PHPUnit tests (lowest, 8.2, windows-latest)	1m 40s
Static Analysis by Psalm (locked, 8.3, ubuntu-latest)	29s
Static Analysis by PHPStan (locked, 8.3, ubuntu-latest)	29s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	1m 33s
PHPUnit tests (lowest, 8.3, windows-latest)	3m 10s
PHPUnit tests (highest, 8.2, ubuntu-latest)	1m 36s
PHPUnit tests (highest, 8.2, windows-latest)	2m 37s
PHPUnit tests (highest, 8.3, ubuntu-latest)	3m 58s
PHPUnit tests (highest, 8.3, windows-latest)	2m 44s
PHPUnit tests (locked, 8.2, ubuntu-latest)	1m 35s
PHPUnit tests (locked, 8.2, windows-latest)	2m 28s
PHPUnit tests (locked, 8.3, ubuntu-latest)	4m 23s
PHPUnit tests (locked, 8.3, windows-latest)	2m 7s
	49m 32s

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