Lock file maintenance #643

Job	Run time
PHPUnit tests (lowest, 8.1, ubuntu-latest)	34s
PHPUnit tests (lowest, 8.1, windows-latest)	58s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	35s
PHPUnit tests (lowest, 8.2, windows-latest)	55s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	55s
PHPUnit tests (lowest, 8.3, windows-latest)	53s
PHPUnit tests (highest, 8.1, ubuntu-latest)	40s
PHPUnit tests (highest, 8.1, windows-latest)	53s
PHPUnit tests (highest, 8.2, ubuntu-latest)	33s
PHPUnit tests (highest, 8.2, windows-latest)	47s
PHPUnit tests (highest, 8.3, ubuntu-latest)	1m 6s
PHPUnit tests (highest, 8.3, windows-latest)	1m 0s
PHPUnit tests (locked, 8.1, ubuntu-latest)	32s
PHPUnit tests (locked, 8.1, windows-latest)	1m 0s
PHPUnit tests (locked, 8.2, ubuntu-latest)	32s
PHPUnit tests (locked, 8.2, windows-latest)	55s
PHPUnit tests (locked, 8.3, ubuntu-latest)	53s
PHPUnit tests (locked, 8.3, windows-latest)	50s
	14m 31s

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