Delay CI cache restore until the toolchain has been installed. #695

Job	Run time
cargo check (msrv) (wasm32)	2m 9s
cargo check (msrv) (windows-latest)	3m 8s
cargo clippy (wasm32)	1m 25s
cargo check (msrv) (macos-latest)	2m 10s
cargo clippy (windows-latest)	1m 50s
cargo check (msrv) (ubuntu-latest)	2m 11s
cargo doc	26s
cargo clippy (macos-latest)	1m 11s
formatting	22s
cargo clippy (ubuntu-latest)	1m 11s
cargo test (windows-latest)	57s
cargo test (macos-latest)	36s
cargo test (wasm32)	32s
typos	5s
cargo test (ubuntu-latest)	32s
	18m 45s

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