Tests

Fix PDOStatement getIterator stub type #21833

Job	Run time
Integration tests (windows-latest)	2m 1s
Tests (8.4, windows-latest)	2m 56s
Determine levels tests matrix	33s
Integration tests (ubuntu-latest)	1m 0s
Tests (8.3, windows-latest)	3m 26s
Tests (8.3, ubuntu-latest)	1m 58s
Tests (8.2, windows-latest)	3m 2s
Tests with old PHPUnit (8.1, windows-latest)	3m 18s
Tests (8.4, ubuntu-latest)	1m 44s
Tests with old PHPUnit (8.0, ubuntu-latest)	1m 43s
Tests with old PHPUnit (7.4, ubuntu-latest)	5m 55s
Tests with old PHPUnit (7.4, windows-latest)	12m 34s
Tests (8.2, ubuntu-latest)	1m 45s
Tests with old PHPUnit (8.1, ubuntu-latest)	1m 50s
Tests with old PHPUnit (8.0, windows-latest)	3m 7s
Levels tests	0s
	46m 52s

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