Remove unnecessary changes in CI #535

Job	Run time
Code coverage	2h 4m 58s
Book tests	2m 31s
Bitrot check	1m 27s
Build target wasm32-unknown-unknown	2m 56s
Build target wasm32-wasi	2m 47s
Intra-doc links	2m 39s
Rustfmt	13s
Test on i686-unknown-linux-gnu	17m 33s
Test on i686-unknown-linux-gnu with beta features	18m 10s
Test on ubuntu-latest	9m 24s
Test on i686-unknown-linux-gnu with nightly features	19m 6s
Test on windows-latest	13m 19s
Test on macOS-latest	7m 37s
Test on ubuntu-latest with beta features	9m 49s
Test on windows-latest with beta features	13m 53s
Test on macOS-latest with beta features	7m 24s
Test on ubuntu-latest with nightly features	10m 36s
Test on windows-latest with nightly features	14m 34s
Test on macOS-latest with nightly features	8m 54s
	4h 47m 50s

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