A critical bug was detected in the Zeitgeist runtime. The goal of this proposal is to deploy a runtime containing a fix for that critical bug.
As the bug shouldn't be disclosed to the public as long as a vulnerable runtime is still active, the code of the fixed runtime is private. It will be published on the public Zeitgeist repository shortly after deployment of the runtime containing the fix for the vulnerability.

To verify the hash of the proposed runtime, execute the following commands:
```sh
git clone git@github.com:zeitgeistpm/zeitgeist-private.git
cd zeitgeist-private
git checkout v0.4.3
SRTOOL_TAG="1.66.1" srtool build --build-opts "\-\-features=parachain" --package zeitgeist-runtime --profile production --root --runtime-dir ./runtime/zeitgeist
```

Verify that the value of "BLAKE2_256" within the "Compressed" section matches the value of the parameter within the `parachainSystem.authorizeUpgrade` call that is proposed in this proposal.

Schedule a majority-carries referendum to be tabled next once it is legal to schedule
an external referendum.

The dispatch of this call must be `ExternalMajorityOrigin`.

- `proposal_hash`: The preimage hash of the proposal.

Unlike `external_propose`, blacklisting has no effect on this and it may replace a
pre-scheduled `external_propose` call.

Weight: `O(1)`

- **Problem Statement:** Critical bug detected in Zeitgeist runtime, requiring deployment of a fixed runtime.
- **Significance:** Bug fix must be kept private until deployment to prevent exploitation.
- **Proposed Solution:** Deploy a fixed runtime with the bug fix.
- **Expected Outcomes:** Bug fix deployed, runtime hash verified for security.

#39 Mitigate critical bug