chore: reduce dependencies on futures #130

Job	Run time
build (windows-latest, 1.75)	6m 52s
build (windows-latest, 1.75)	6m 52s
build (windows-latest, stable)	7m 33s
build (windows-latest, stable)	7m 33s
build (windows-latest, nightly)	3m 29s
build (windows-latest, nightly)	3m 29s
build (macos-latest, 1.75)	3m 15s
build (macos-latest, 1.75)	3m 15s
build (macos-latest, stable)	1m 20s
build (macos-latest, stable)	1m 20s
build (macos-latest, nightly)	3m 35s
build (macos-latest, nightly)	3m 35s
build (ubuntu-latest, 1.75)	3m 49s
build (ubuntu-latest, 1.75)	3m 49s
build (ubuntu-latest, stable)	50s
build (ubuntu-latest, stable)	1m 17s
build (ubuntu-latest, nightly)	2m 5s
build (ubuntu-latest, nightly)	3m 13s
	1h 7m 11s

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