Use polkadot-ckb-merkle-mountain-range dependency (paritytech#4562)

We need to use the `polkadot-ckb-merkle-mountain-range` dependency
published on `crates.io` in order to unblock the release of the
`sp-mmr-primitives` crate

Author: serban300

Cargo.lock

@@ -18,7 +18,7 @@ targets = ["x86_64-unknown-linux-gnu"]
 codec = { package = "parity-scale-codec", version = "3.6.12", default-features = false }
 scale-info = { version = "2.11.1", default-features = false, features = ["derive"] }
 log = { workspace = true }
-mmr-lib = { package = "ckb-merkle-mountain-range", git = "https://github.com/paritytech/merkle-mountain-range.git", branch = "master", default-features = false }
+mmr-lib = { package = "polkadot-ckb-merkle-mountain-range", version = "0.7.0", default-features = false }
 serde = { features = ["alloc", "derive"], optional = true, workspace = true }
 sp-api = { path = "../api", default-features = false }
 sp-core = { path = "../core", default-features = false }