chore: fix `constants` module typo #4335

Job	Run time
clippy	1m 19s
check	22s
check no_std	20s
check serde	23s
docs	1m 5s
check std	24s
check no_std kzg-rs	35s
test stable --no-default-features	48s
test stable	50s
test stable --all-features	1m 12s
fmt	8s
test beta --no-default-features	58s
TyposCheck	6s
test beta	58s
test beta --all-features	1m 17s
test nightly --no-default-features	47s
test nightly	1m 2s
test nightly --all-features	1m 7s
	13m 41s

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