Delay CI cache restore until the toolchain has been installed. (#732) #1729

Job	Run time
cargo check (msrv) (wasm32)	1m 31s
cargo check (msrv) (windows-latest)	4m 24s
cargo check (msrv) (macos-latest)	1m 25s
cargo check (msrv) (ubuntu-latest)	1m 22s
cargo check (aarch64-android)	1m 26s
cargo clippy (wasm32)	2m 52s
cargo clippy (windows-latest)	5m 56s
cargo clippy (macos-latest)	3m 45s
formatting	34s
cargo clippy (ubuntu-latest)	4m 2s
cargo doc	1m 43s
Prime LFS Cache	5s
cargo test (wasm32)	1m 26s
typos	8s
cargo test (windows-latest)	5m 43s
cargo test (macos-latest)	3m 42s
cargo test (ubuntu-latest)	4m 56s
	45m 0s

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