The center of this proposal is a batch call which authorizes the runtime upgrades v0.5.1 and v0.5.2, but the latter is authorized approximately 24 hours (7200 blocks) after the former to provides some time to execute the upgrade. Both of those upgrades have already been tested on Battery Station for a couple of weeks and are running stable. The upgrades have been withheld on mainnet because there have been some issue with  transaction fee payment with currencies other than ZTG, but this issue has been resolved by now.

https://github.com/zeitgeistpm/zeitgeist/releases/tag/v0.5.1
https://github.com/zeitgeistpm/zeitgeist/releases/tag/v0.5.2

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)`

Send a batch of dispatch calls.
Unlike `batch`, it allows errors and won't interrupt.

May be called from any origin except `None`.

- `calls`: The calls to be dispatched from the same origin. The number of call must not
  exceed the constant: `batched_calls_limit` (available in constant metadata).

If origin is root then the calls are dispatch without checking origin filter. (This
includes bypassing `frame_system::Config::BaseCallFilter`).

# <weight>
- Complexity: O(C) where C is the number of calls to be batched.
# </weight>

- **Problem Statement:** Implementing runtime upgrades v0.5.1 and v0.5.2 on Zeitgeist mainnet.
- **Significance:** Ensuring stable operation post-upgrades and resolving transaction fee payment issues.
- **Proposed Solution:** Authorizing the upgrades sequentially with a 24-hour gap between them.
- **Expected Outcomes:** Smooth execution of upgrades, improved stability, and resolved transaction fee payment issues.

#53 Upgrade to v0.5.1 (spec_version 54) and v0.5.2 (spec_version 55)