feat: rename smol to futures #8

Job	Run time
test (stable, windows-latest, tokio,futures)	1m 8s
test (stable, macos-15, tokio,futures)	23s
test (stable, ubuntu-22.04, tokio,futures,io-uring)	26s
test (stable, ubuntu-22.04, tokio,futures,polling)	42s
	2m 39s

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