Remove zerocopy from rand #1255

# to view logs

Job	Run time
Check doc	36s
Check Clippy and rustfmt	11s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 9s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	1m 6s
test-ios	22s
test (macos-latest, x86_64-apple-darwin, stable)	1m 21s
test-miri	5m 7s
test (windows-latest, x86_64-pc-windows-gnu, stable)	3m 31s
test-no-std	18s
test (windows-latest, x86_64-pc-windows-msvc, beta)	2m 1s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.63.0)	3m 2s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 9s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	56s
	20m 49s

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