build(deps): bump keccak from 0.1.5 to 0.1.6 (#6472)

Bumps [keccak](https://github.com/RustCrypto/sponges) from 0.1.5 to 0.1.6.
- [Commits](https://github.com/RustCrypto/sponges/compare/keccak-v0.1.5...keccak-v0.1.6)

---
updated-dependencies:
- dependency-name: keccak
  dependency-version: 0.1.6
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.lock

@@ -4359,9 +4359,9 @@ dependencies = [
 
 [[package]]
 name = "keccak"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecc2af9a1119c51f12a14607e783cb977bde58bc069ff0c3da1095e635d70654"
+checksum = "cb26cec98cce3a3d96cbb7bced3c4b16e3d13f27ec56dbd62cbc8f39cfb9d653"
 dependencies = [
  "cpufeatures",
 ]