PHP 8.4 support #2571

Job	Run time
Check Backward Compatibility (locked, 8.4, ubuntu-latest)	32s
Check Coding Standards (locked, 8.2, ubuntu-latest)	28s
Test Compatibility (locked, 8.4, ubuntu-latest)	27s
Run benchmarks (locked, 8.4, ubuntu-latest)	30s
Test Compatibility (locked, 8.4, windows-latest)	56s
Check Demo Scripts (locked, 8.4, ubuntu-latest)	15s
Mutation tests (locked, 8.3, ubuntu-latest)	11m 52s
Run benchmarks (locked, 8.4, windows-latest)	47s
Static Analysis by PHPStan (locked, 8.2, ubuntu-latest)	1m 9s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	37s
Static Analysis by Psalm (locked, 8.3, ubuntu-latest)	50s
Static Analysis by PHPStan (locked, 8.3, ubuntu-latest)	1m 9s
PHPUnit tests (lowest, 8.2, windows-latest)	8s
Static Analysis by PHPStan (locked, 8.4, ubuntu-latest)	1m 8s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.3, windows-latest)	6s
PHPUnit tests (lowest, 8.4, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.4, windows-latest)	1s
PHPUnit tests (highest, 8.2, ubuntu-latest)	1m 0s
PHPUnit tests (highest, 8.2, windows-latest)	44s
PHPUnit tests (highest, 8.3, ubuntu-latest)	58s
PHPUnit tests (highest, 8.3, windows-latest)	45s
PHPUnit tests (highest, 8.4, ubuntu-latest)	1s
PHPUnit tests (highest, 8.4, windows-latest)	53s
PHPUnit tests (locked, 8.2, ubuntu-latest)	57s
PHPUnit tests (locked, 8.2, windows-latest)	45s
PHPUnit tests (locked, 8.3, ubuntu-latest)	58s
PHPUnit tests (locked, 8.3, windows-latest)	45s
PHPUnit tests (locked, 8.4, ubuntu-latest)	41s
PHPUnit tests (locked, 8.4, windows-latest)	43s
	30m 7s

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