fix: use no std packages #27

Job	Run time
test ubuntu-latest stable --no-default-features	12s
test ubuntu-latest stable	34s
test ubuntu-latest stable --all-features	35s
doctest	11s
feature-checks	19s
test ubuntu-latest nightly --no-default-features	18s
test ubuntu-latest nightly	20s
no-std	15s
test ubuntu-latest nightly --all-features	35s
wasm-unknown	12s
test ubuntu-latest 1.76 --no-default-features	24s
test ubuntu-latest 1.76	18s
wasm-wasi	14s
test windows-latest stable --no-default-features	40s
test windows-latest stable	46s
cfg-check	14s
test windows-latest stable --all-features	1m 18s
test windows-latest nightly --no-default-features	50s
clippy	8s
test windows-latest nightly	51s
docs	21s
test windows-latest nightly --all-features	1m 15s
test windows-latest 1.76 --no-default-features	35s
fmt	11s
test windows-latest 1.76	45s
	12m 21s

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