clone-solana-keccak-hasher is used at run time in 2 crates. It's used only as a dev dependency in 2 crates (of which 1 directly).

Depender (with downloads and own rev deps) clone-solana-keccak-hasher version
1 clone-solana-example-mocks ^2.2.1
1 clone-solana-program ^2.2.1
1 clone-solana-secp256k1-program dev ^2.2.1