chore(deps): update codecov/codecov-action action to v6 #981

Job	Run time
cargo clippy -- -D warnings (ubuntu-latest)	16s
cargo fmt --all -- --check	5s
Code Coverage (macos-latest, macos)	1m 49s
Code Coverage (ubuntu-latest, unix)	1m 41s
cargo clippy -- -D warnings (macOS-latest)	16s
Code Coverage (windows-latest, windows)	4m 9s
cargo clippy -- -D warnings (windows-latest)	50s
cargo test (ubuntu-latest)	32s
cargo check (macOS-latest)	16s
cargo check (windows-latest)	1m 4s
cargo check (ubuntu-latest)	15s
cargo test (macOS-latest)	41s
cargo test (windows-latest)	1m 29s
	13m 23s

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