Remove dependency on `derive` feature of `arbitrary`. (#530) #108

Job	Run time
Check code formatting	7s
Linux (1.56.0)	2m 0s
Linux (stable)	1m 11s
Linux (beta)	23s
Linux (nightly)	18s
Linux (--features serde, 1.56.0)	2m 11s
Linux (--features serde, stable)	18s
Linux (--features serde, beta)	23s
Linux (--features serde, nightly)	21s
Linux (--no-default-features --features libm, 1.56.0)	2m 1s
Linux (--no-default-features --features libm, stable)	14s
Linux (--no-default-features --features libm, beta)	20s
Linux (--no-default-features --features libm, nightly)	19s
Linux (stable, --features mint)	1m 17s
Linux (stable, --features bytemuck)	13s
Linux (stable, --features arbitrary)	12s
Linux (nightly, --features unstable)	16s
Linux (nightly, --features unstable,serde)	25s
Result	1s
	12m 30s

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