Tests

Bump actions/upload-pages-artifact from 1 to 3 #669

Job	Run time
test-ios	25s
Check doc	1m 8s
test-cross (ubuntu-latest, powerpc-unknown-linux-gnu, stable)	1m 26s
test (ubuntu-latest, x86_64-unknown-linux-gnu, stable)	55s
test (macos-latest, x86_64-apple-darwin, stable)	3m 0s
test-miri	2m 50s
test-no-std	13s
test (windows-latest, x86_64-pc-windows-gnu, stable)	1m 58s
test (windows-latest, x86_64-pc-windows-msvc, beta)	1m 50s
test (ubuntu-latest, x86_64-unknown-linux-gnu, MSRV, 1.60.0)	4m 6s
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)	32s
	19m 5s

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