ci: use `-Cinstrument-coverage` instead of `-Zprofile` #1316

Job	Run time
cargo fmt --all -- --check	5s
cargo check (ubuntu-latest)	12s
cargo clippy -- -D warnings	19s
Code coverage (ubuntu-latest, nightly, --all-features)	45s
cargo check (macOS-latest)	21s
cargo check (windows-latest)	2m 24s
cargo test (ubuntu-latest)	46s
cargo test (macOS-latest)	35s
cargo test (windows-latest)	1m 46s
	7m 13s

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