Delay CI cache restore until the toolchain has been installed. (#396) #697

Job	Run time
cargo clippy (windows-latest)	1m 58s
cargo clippy (macos-latest)	1m 13s
cargo clippy (ubuntu-latest)	1m 18s
cargo clippy (wasm32)	1m 16s
cargo check (msrv) (wasm32)	2m 8s
cargo check (msrv) (windows-latest)	3m 6s
cargo doc	22s
cargo check (msrv) (macos-latest)	2m 30s
formatting	24s
cargo check (msrv) (ubuntu-latest)	2m 7s
cargo test (windows-latest)	58s
cargo test (macos-latest)	44s
cargo test (wasm32)	31s
cargo test (ubuntu-latest)	29s
typos	9s
	19m 13s

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