CI fixes #4069

Job	Run time
Bitrot check	1m 38s
Book tests	1m 25s
Build target wasm32-unknown-unknown	1m 53s
Intra-doc links	1m 29s
Code coverage	3m 34s
Build target wasm32-wasi	1m 51s
Rustfmt	13s
Test on i686-unknown-linux-gnu	13m 30s
Test on ubuntu-latest	7m 17s
Test on i686-unknown-linux-gnu with beta features	13m 53s
Test on i686-unknown-linux-gnu with nightly features	15m 3s
Test on windows-latest	10m 49s
Test on macOS-latest	1m 48s
Test on ubuntu-latest with beta features	7m 24s
Test on windows-latest with beta features	10m 23s
Test on macOS-latest with beta features	2m 46s
Test on ubuntu-latest with nightly features	8m 18s
Test on windows-latest with nightly features	11m 13s
Test on macOS-latest with nightly features	2m 10s
	1h 56m 37s

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