Tests

fix: statetest json set spec_id (#1766) #1

Job	Run time
check	18s
check serde	27s
clippy	1m 23s
check std	18s
docs	1m 19s
check no_std	22s
check no_std kzg-rs	32s
TyposCheck	7s
fmt	4s
test stable --no-default-features	2m 21s
test stable	2m 27s
test stable --all-features	2m 26s
test beta --no-default-features	2m 21s
test beta	2m 23s
test beta --all-features	2m 28s
test nightly --no-default-features	2m 10s
test nightly	2m 5s
test nightly --all-features	2m 7s
	25m 38s

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