message: fix(runtime-core) `hasher` does not need to be mutable.
  This patch updates the `hasher` variable. It is declared as mutable,
  but it's never mutated.
diff: @@ -48,7 +48,7 @@ impl WasmHash {
  let mut state = blake2bp::State::new();
  state.update(wasm);
  - let mut hasher = state.finalize();
  + let hasher = state.finalize();
  let generic_array = hasher.as_bytes();
  first_part.copy_from_slice(&generic_array[0..32]);
  