Tests

Update zerocopy; trim unused methods #671

Job	Run time
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 19s
test-ios	30s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	29s
Check doc	1m 11s
test (macos-latest, x86_64-apple-darwin, stable)	1m 26s
test-miri	38s
test-no-std	12s
test (windows-latest, x86_64-pc-windows-gnu, stable)	2m 27s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 47s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.60.0)	3m 20s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	1m 17s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	53s
	15m 29s

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