Prop 338: Instantiate pyth-vaa contract (Pyth upgrade phase 2b)

By voting YES on this proposal, you approve the following changes:

Instantiates the pyth-pro price contract from the previously stored code ID, paired with the pyth-vaa contract instantiated in the preceding proposal. update_fee is set to 1 uakt — the minimum valid value, as CosmWasm rejects zero-value coin transfers