Consolidate some `using` statements and make them explicit #2821

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Job	Run time
Documentation	15m 40s
test (1.6, ubuntu-latest)	15m 10s
test (1.9, ubuntu-latest)	14m 47s
test (1.10, ubuntu-latest)	30m 8s
test (nightly, ubuntu-latest)	20m 56s
test (1.10, macOS-latest)	44m 16s
test (1.10, windows-latest)	38m 18s
	2h 59m 15s