Remove dependency on `derive` feature of `arbitrary`. #106

Job	Run time
Check code formatting	4s
Linux (1.56.0)	2m 0s
Linux (stable)	13s
Linux (beta)	17s
Linux (nightly)	19s
Linux (--features serde, 1.56.0)	2m 7s
Linux (--features serde, stable)	18s
Linux (--features serde, beta)	25s
Linux (--features serde, nightly)	23s
Linux (--no-default-features --features libm, 1.56.0)	1m 58s
Linux (--no-default-features --features libm, stable)	15s
Linux (--no-default-features --features libm, beta)	19s
Linux (--no-default-features --features libm, nightly)	17s
Linux (stable, --features mint)	11s
Linux (stable, --features bytemuck)	15s
Linux (stable, --features arbitrary)	12s
Linux (nightly, --features unstable)	18s
Linux (nightly, --features unstable,serde)	21s
Result	1s
	10m 13s

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