Motion 13 is submitted: Polkadot runtime update to v23

Upgrade priority: MEDIUM

Specs of the runtime can be found [here](https://github.com/paritytech/polkadot/releases/tag/v0.8.23).

All Councillors please vote at your convenience. The preimage can be verified in the release notes.

- There is a motion to update Polkadot runtime to version 23.
- The upgrade priority is medium.
- The specifications of the runtime can be found at a specific website.
- All council members are asked to vote on this motion.
- There is a shorter summary at the end called "Tl;dr".

#13 SetCode: Polkadot runtime v23