ci: use `-Cinstrument-coverage` instead of `-Zprofile` #282

Job	Run time
cargo fmt --all -- --check	16s
cargo check (ubuntu-latest)	8s
cargo clippy -- -D warnings (ubuntu-latest)	10s
Code Coverage (ubuntu-latest, unix)	1m 1s
cargo check (macOS-latest)	12s
cargo clippy -- -D warnings (macOS-latest)	13s
Code Coverage (macos-latest, macos)	58s
cargo test (ubuntu-latest)	17s
cargo check (windows-latest)	35s
cargo clippy -- -D warnings (windows-latest)	1m 31s
Code Coverage (windows-latest, windows)	42s
cargo test (macOS-latest)	21s
cargo test (windows-latest)	1m 22s
	7m 46s

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