Tweak CI config #2672

Job	Run time
miri	1m 33s
test (1.26)	11m 33s
test (no rustup)	2m 4s
test (1.30)	9m 24s
test (stable)	8m 48s
test (1.31)	10m 56s
test (beta)	7m 52s
test (1.36)	11m 16s
test (nightly)	7m 41s
test (1.39)	13m 35s
test (nightly, macos-11)	10m 39s
test (1.41)	10m 58s
test (nightly, windows-2019)	11m 51s
deny / deny	21s
msrv / msrv	5m 3s
tidy / tidy	1m 5s
release-dry-run / prepare	11s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 53s
release-dry-run / build (aarch64-unknown-linux-musl)	1m 14s
release-dry-run / build (aarch64-apple-darwin, macos-11)	1m 37s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	2m 43s
release-dry-run / build (x86_64-unknown-linux-gnu)	56s
release-dry-run / build (x86_64-unknown-linux-musl)	1m 8s
release-dry-run / build (x86_64-apple-darwin, macos-11)	1m 36s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	2m 34s
release-dry-run / build (x86_64-unknown-freebsd)	1m 51s
release-dry-run / build (universal-apple-darwin, macos-11)	1m 49s
	2h 22m 11s

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