Lock file maintenance #1224

Job	Run time
Unit tests (lowest, 8.3, ubuntu-latest)	23s
Unit tests (lowest, 8.4, ubuntu-latest)	14s
Unit tests (lowest, 8.2, ubuntu-latest)	16s
Unit tests (locked, 8.4, windows-latest)	54s
Unit tests (highest, 8.2, ubuntu-latest)	21s
Unit tests (highest, 8.3, ubuntu-latest)	15s
Unit tests (highest, 8.4, ubuntu-latest)	21s
Unit tests (locked, 8.4, ubuntu-latest)	24s
	3m 8s

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