ci: use `-Cinstrument-coverage` instead of `-Zprofile` #1320

Job	Run time
cargo fmt --all -- --check	7s
cargo test (ubuntu-latest)	34s
cargo check (ubuntu-latest)	12s
cargo clippy -- -D warnings	16s
cargo test (macOS-latest)	36s
cargo check (macOS-latest)	16s
Code coverage (ubuntu-latest, nightly, --all-features)	44s
cargo check (windows-latest)	3m 0s
cargo test (windows-latest)	2m 16s
	8m 1s

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