chore(deps): update codecov/codecov-action action to v4 #16

Job	Run time
cargo clippy -- -D warnings (ubuntu-latest)	9s
cargo check (ubuntu-latest)	9s
cargo clippy -- -D warnings (macOS-latest)	26s
cargo check (macOS-latest)	35s
cargo clippy -- -D warnings (windows-latest)	45s
cargo check (windows-latest)	1m 18s
Code Coverage (ubuntu-latest, unix)	1m 35s
cargo fmt --all -- --check	5s
Code Coverage (macos-latest, macos)	40s
Code Coverage (windows-latest, windows)	1m 8s
cargo test (ubuntu-latest)	37s
cargo test (macOS-latest)	14s
cargo test (windows-latest)	1m 16s
	8m 57s

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