Using a different Rust toolchain action for CI jobs. #1354

Job	Run time
rustfmt	21s
rustfmt	21s
test (stable)	33s
test (stable)	33s
test (beta)	38s
test (beta)	38s
test (nightly)	35s
test (nightly)	35s
test (nightly-musl)	1m 5s
test (nightly-musl)	1m 5s
test (nightly-mips)	1m 5s
test (nightly-mips)	1m 5s
test (nightly-32)	1m 5s
test (nightly-32)	1m 5s
test (macos)	55s
test (macos)	55s
test (win-msvc)	54s
test (win-msvc)	1m 20s
test (win-gnu)	48s
test (win-gnu)	48s
test (msrv)	1m 4s
test (msrv)	1m 4s
test (wasm32, ubuntu-latest, nightly)	1m 2s
test (wasm32, ubuntu-latest, nightly)	1m 2s
	20m 36s

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