Lock file maintenance #1152

Job	Run time
Unit tests (lowest, 8.2, ubuntu-latest)	21s
Unit tests (lowest, 8.3, ubuntu-latest)	21s
Unit tests (lowest, 8.4, ubuntu-latest)	19s
Unit tests (highest, 8.2, ubuntu-latest)	22s
Unit tests (highest, 8.3, ubuntu-latest)	22s
Unit tests (highest, 8.4, ubuntu-latest)	22s
Unit tests (locked, 8.4, ubuntu-latest)	18s
Unit tests (locked, 8.4, windows-latest)	51s
	3m 16s

Provide feedback