chore(deps): update codecov/codecov-action action to v4 #50

Job	Run time
cargo check (ubuntu-latest)	27s
cargo check (macOS-latest)	50s
cargo check (windows-latest)	1m 52s
cargo clippy -- -D warnings (ubuntu-latest)	22s
Code Coverage (ubuntu-latest, unix)	1m 58s
cargo clippy -- -D warnings (macOS-latest)	33s
Code Coverage (macos-latest, macos)	1m 5s
cargo clippy -- -D warnings (windows-latest)	1m 25s
cargo fmt --all -- --check	12s
cargo test (ubuntu-latest)	30s
Code Coverage (windows-latest, windows)	2m 22s
cargo test (macOS-latest)	45s
cargo test (windows-latest)	1m 47s
	14m 8s

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