Lock file maintenance #637

Job	Run time
PHPUnit tests (lowest, 8.1, ubuntu-latest)	34s
PHPUnit tests (lowest, 8.1, windows-latest)	1m 0s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	34s
PHPUnit tests (lowest, 8.2, windows-latest)	59s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	55s
PHPUnit tests (lowest, 8.3, windows-latest)	48s
PHPUnit tests (highest, 8.1, ubuntu-latest)	36s
PHPUnit tests (highest, 8.1, windows-latest)	58s
PHPUnit tests (highest, 8.2, ubuntu-latest)	33s
PHPUnit tests (highest, 8.2, windows-latest)	1m 3s
PHPUnit tests (highest, 8.3, ubuntu-latest)	53s
PHPUnit tests (highest, 8.3, windows-latest)	48s
PHPUnit tests (locked, 8.1, ubuntu-latest)	30s
PHPUnit tests (locked, 8.1, windows-latest)	1m 6s
PHPUnit tests (locked, 8.2, ubuntu-latest)	31s
PHPUnit tests (locked, 8.2, windows-latest)	52s
PHPUnit tests (locked, 8.3, ubuntu-latest)	56s
PHPUnit tests (locked, 8.3, windows-latest)	49s
	14m 25s

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