ci: use `-Cinstrument-coverage` instead of `-Zprofile` #1317

Job	Run time
Code coverage (ubuntu-latest, nightly, --all-features)	45s
cargo clippy -- -D warnings	23s
cargo fmt --all -- --check	5s
cargo check (ubuntu-latest)	14s
cargo test (ubuntu-latest)	37s
cargo check (macOS-latest)	18s
cargo test (macOS-latest)	42s
cargo check (windows-latest)	2m 6s
cargo test (windows-latest)	2m 53s
	8m 3s

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