Lock file maintenance #619

Job	Run time
PHPUnit tests (lowest, 8.1, ubuntu-latest)	33s
PHPUnit tests (lowest, 8.1, windows-latest)	1m 13s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	33s
PHPUnit tests (lowest, 8.2, windows-latest)	1m 16s
PHPUnit tests (lowest, 8.3, ubuntu-latest)	1m 7s
PHPUnit tests (lowest, 8.3, windows-latest)	57s
PHPUnit tests (highest, 8.1, ubuntu-latest)	38s
PHPUnit tests (highest, 8.1, windows-latest)	1m 5s
PHPUnit tests (highest, 8.2, ubuntu-latest)	39s
PHPUnit tests (highest, 8.2, windows-latest)	1m 14s
PHPUnit tests (highest, 8.3, ubuntu-latest)	57s
PHPUnit tests (highest, 8.3, windows-latest)	1m 13s
PHPUnit tests (locked, 8.1, ubuntu-latest)	30s
PHPUnit tests (locked, 8.1, windows-latest)	1m 13s
PHPUnit tests (locked, 8.2, ubuntu-latest)	36s
PHPUnit tests (locked, 8.2, windows-latest)	53s
PHPUnit tests (locked, 8.3, ubuntu-latest)	59s
PHPUnit tests (locked, 8.3, windows-latest)	51s
	16m 27s

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