Tests

Exception.stub - better `getTrace()` return type #22305

Job	Run time
Determine levels tests matrix	7s
Integration tests (ubuntu-latest)	6s
Integration tests (windows-latest)	11s
Tests with old PHPUnit (8.1, windows-latest)	11s
Tests (8.2, windows-latest)	9s
Tests with old PHPUnit (8.1, ubuntu-latest)	7s
Tests with old PHPUnit (7.4, ubuntu-latest)	7s
Tests (8.3, ubuntu-latest)	6s
Tests (8.4, ubuntu-latest)	9s
Tests (8.3, windows-latest)	11s
Tests with old PHPUnit (8.0, windows-latest)	10s
Tests (8.5, windows-latest)	10s
Tests (8.4, windows-latest)	10s
Tests (8.5, ubuntu-latest)	9s
Tests (8.2, ubuntu-latest)	6s
Tests with old PHPUnit (8.0, ubuntu-latest)	7s
Tests with old PHPUnit (7.4, windows-latest)	11s
Levels tests	1s
	2m 28s

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