fix: rm dep on alloy-serde #42

Job	Run time
doctest	10s
clippy	10s
cfg-check	13s
docs	15s
feature-checks	19s
fmt	13s
no-std	11s
test ubuntu-latest stable --no-default-features	11s
wasm-unknown	20s
wasm-wasi	9s
test ubuntu-latest stable	18s
test ubuntu-latest stable --all-features	37s
test ubuntu-latest nightly --no-default-features	20s
test ubuntu-latest nightly	24s
test ubuntu-latest nightly --all-features	35s
test ubuntu-latest 1.79 --no-default-features	19s
test ubuntu-latest 1.79	25s
test windows-latest stable --no-default-features	1m 56s
test windows-latest stable	2m 32s
test windows-latest stable --all-features	2m 54s
test windows-latest nightly --no-default-features	1m 23s
test windows-latest nightly	1m 10s
test windows-latest nightly --all-features	1m 11s
test windows-latest 1.79 --no-default-features	41s
test windows-latest 1.79	52s
	17m 48s

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