Use polkadot-ckb-merkle-mountain-range dependency

[serban300]

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

[FlorianFranzen]

Please make sure to not pull from master when renaming things:

error: no matching package named `ckb-merkle-mountain-range` found
location searched: https://github.com/paritytech/merkle-mountain-range.git?branch=master
required by package `sp-mmr-primitives v26.0.0 (https://github.com/paritytech/polkadot-sdk?tag=polkadot-v1.12.0#b4016902)`
    ... which satisfies git dependency `sp-mmr-primitives` of package `sp-consensus-beefy v13.0.0 (https://github.com/paritytech/polkadot-sdk?tag=polkadot-v1.12.0#b4016902)`
    ... which satisfies git dependency `sp-consensus-beefy` of package `timechain-node v0.5.0 (/home/florian/Analog/timechain/node)`

This now lead to the latest release v1.12.0 of the SDK not building if no lock was present or one tried to update.

[ggwpez]

Using git dependencies is the general issue. We removed this one now, but looks like it is still present in the 1.12 release.
But yea, having master instead of a commit hash makes it easier to error here.