More information about the changes at https://github.com/zeitgeistpm/zeitgeist/releases/tag/v0.3.9

 Set the new runtime code.

 # <weight>
 - `O(C + S)` where `C` length of `code` and `S` complexity of `can_set_code`
 - 1 storage write (codec `O(C)`).
 - 1 call to `can_set_code`: `O(S)` (calls `sp_io::misc::runtime_version` which is expensive).
 - 1 event.
 The weight of this function is dependent on the runtime, but generally this is very expensive.
 We will treat this as a full block.
 # </weight>

- Problem Statement: Lack of information about changes at Zeitgeist.
- Audience: Users of Zeitgeist.
- Significance: Users need to be informed about the changes in order to understand and adapt to the new version.
- Proposed Solution: Provide more information about the changes at Zeitgeist.
- Expected Outcomes: Users will have a better understanding of the changes and be able to adapt to the new version more effectively.

#35 Authorize runtime upgrade to v0.3.9

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