Change future imports that can be processed by core and rust version 1.64.0 #3426

Job	Run time
cargo +1.71 build	42s
cargo +1.64 build (futures-{core, io, sink})	1m 11s
cargo build --target thumbv7m-none-eabi	26s
cargo hack check --feature-powerset	2m 37s
cargo bench	41s
cargo miri test	9m 34s
cargo test -Z sanitizer=thread	59s
cargo +beta build	35s
cargo doc	20s
cargo clippy	17s
cargo test (macos-latest)	4m 20s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 12s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 23s
cargo test (ubuntu-24.04-arm, armv7-unknown-linux-gnueabihf)	2m 53s
cargo test (ubuntu-24.04-arm)	2m 44s
cargo test -Z sanitizer=memory	1m 11s
cargo +nightly build	34s
cargo test (ubuntu-latest)	2m 31s
cargo build --target thumbv6m-none-eabi	25s
cargo minimal-versions build	27s
cargo +stable build	41s
tidy	8s
cargo test -Z sanitizer=address	1m 6s
cargo test (ubuntu-latest, s390x-unknown-linux-gnu)	3m 33s
cargo test (windows-latest)	5m 26s
	52m 56s

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