Tests

Bump actions/configure-pages from 2 to 4 #664

Job	Run time
Check doc	1m 11s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	53s
test (macos-latest, x86_64-apple-darwin, stable)	1m 36s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 48s
test (windows-latest, x86_64-pc-windows-gnu, stable)	2m 15s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 54s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.60.0)	4m 11s
test-ios	41s
test (ubuntu-latest, sudo apt-get update ; sudo apt install gcc-multilib, i686-unknown-linux-gnu,...	42s
test (ubuntu-latest, x86_64-unknown-linux-gnu, nightly, minimal_versions)	31s
test-miri	2m 48s
test-no-std	15s
	18m 45s

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