Bump rlp from 0.5.2 to 0.6.1

Bumps [rlp](https://github.com/paritytech/parity-common) from 0.5.2 to 0.6.1.
- [Commits](paritytech/parity-common@rlp-v0.5.2...rlp-v0.6.1)

---
updated-dependencies:
- dependency-name: rlp
  dependency-version: 0.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -47,7 +47,7 @@ qr2term = { version = "0.3", default-features = false }
 quote = { version = "1.0", default-features = false }
 rand = { version = "0.8", default-features = false }
 reqwest = { version = "0.11", default-features = false }
-rlp = { version = "0.5", default-features = false }
+rlp = { version = "0.6", default-features = false }
 rustc-hex = { version = "2", default-features = false }
 scale-info = { version = "2.11.6", default-features = false }
 secp256k1 = { version = "0.27", default-features = false }