fix: `Sealed::hash` serde #2159

Job	Run time
check no_std	40s
docs	55s
features stable	2m 15s
fmt	13s
features stable --all-targets	3m 23s
miri --no-default-features	5m 2s
features nightly	2m 24s
clippy	1m 14s
miri	5m 11s
features nightly --all-targets	3m 43s
miri --all-features	7m 51s
test ubuntu-latest stable --no-default-features	1m 10s
wasm	45s
test ubuntu-latest stable	1m 28s
test ubuntu-latest nightly --no-default-features	1m 16s
test ubuntu-latest nightly	1m 18s
test ubuntu-latest 1.79 --no-default-features	38s
test ubuntu-latest 1.79	2m 17s
test windows-latest stable --no-default-features	4m 2s
test windows-latest stable	4m 33s
test windows-latest nightly --no-default-features	3m 7s
test windows-latest nightly	2m 52s
test windows-latest 1.79 --no-default-features	2m 19s
test windows-latest 1.79	2m 8s
test ubuntu-latest 1.79 --features json	39s
test windows-latest 1.79 --features json	1m 33s
test ubuntu-latest nightly --all-features	1m 27s
test windows-latest nightly --all-features	4m 2s
ci success	3s
	1h 8m 28s

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