chore: use alloc #4290

Job	Run time
doctest	1m 4s
wasm-unknown	51s
wasm-wasi	1m 26s
test ubuntu-latest stable --no-default-features	1m 25s
cfg-check	23s
check no_std	16s
clippy	36s
test ubuntu-latest stable	1m 18s
test ubuntu-latest stable --all-features	2m 12s
docs	1m 1s
test ubuntu-latest nightly --no-default-features	1m 16s
feature-checks	3m 25s
fmt	16s
test ubuntu-latest nightly	1m 13s
test ubuntu-latest nightly --all-features	2m 14s
test ubuntu-latest 1.79 --no-default-features	46s
test ubuntu-latest 1.79	45s
test windows-latest stable --no-default-features	3m 47s
test windows-latest stable	4m 2s
test windows-latest stable --all-features	5m 53s
test windows-latest nightly --no-default-features	3m 14s
test windows-latest nightly	3m 2s
test windows-latest nightly --all-features	4m 56s
test windows-latest 1.79 --no-default-features	1m 47s
test windows-latest 1.79	2m 54s
	50m 2s

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