style: use core `ready`, `poll_fn`, and `pin!` (#331) #927

Job	Run time
netlify_dryrun	2m 37s
just check	4m 33s
just clippy	4m 50s
docs	2m 26s
rustfmt	21s
cargo miri test --package forth3 (host)	1m 27s
just test	2m 22s
cargo build mnemos-d1	1m 28s
cargo build mnemos-esp32c3-buddy	57s
cargo build mnemos-x86_64-bootloader	2m 23s
all systems go!	1s
	23m 25s

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