Consolidate some `using` statements and make them explicit #2822

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Job	Run time
Documentation	15m 46s
test (1.6, ubuntu-latest)	14m 57s
test (1.9, ubuntu-latest)	14m 54s
test (1.10, ubuntu-latest)	29m 24s
test (nightly, ubuntu-latest)	20m 30s
test (1.10, macOS-latest)	46m 10s
test (1.10, windows-latest)	39m 24s
	3h 1m 5s