This proposal aims to upgrade Polkadot’s runtime to version [0.9.18](https://github.com/paritytech/polkadot/releases/tag/v0.9.18): 

Release notes, runtime changes and proposal hash can be found [HERE](https://github.com/paritytech/polkadot/releases/tag/v0.9.18). This release includes, among others, PR 4772 (login two parachains to swap slots), PR 10947 (bringing back maxnominators as a meatada constant), PR 4851 (adding proxy types for Kappa Sigma Mu) and PR 10690 (upgradable contracts using set_code function).

- Call hash for Polkadot upgrade: `0xa9ad07f0ea8e95c15247ba05a2754405acbf4de6cea8fe0cfdb94196c6093670`

Feel free to use srtool yourself to check the proposal hash. If passed by the Council, this proposal should be voted by the community and enacted after. Make sure to vote at your convenience!

Set the new runtime code.

# <weight>
- `O(C + S)` where `C` length of `code` and `S` complexity of `can_set_code`
- 1 call to `can_set_code`: `O(S)` (calls `sp_io::misc::runtime_version` which is
  expensive).
- 1 storage write (codec `O(C)`).
- 1 digest item.
- 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>

: 
- Referendum proposes upgrade of Polkadot runtime to version 0.9.18
- Release includes multiple PR's, including PR 4772, 10947, 4851, and 10690
- Proposal hash: `0xa9ad07f0ea8e95c15247ba05a2754405acbf4de6cea8fe0cfdb94196c6093670`
- Referendum needs to be voted by the Council before enacted by the Community

#57 Runtime Upgrade v9180 - Polkadot Network