Set Voting Period to 5 days

As the number of nouners and nouns sub-communities increase, we will see more proposals appear on-chain without prior off-chain coordination. This is a proposal to increase the 'Voting Period' (from the current 3 days) to 5 days, so that nouners have more time to diligence proposals and to decide how they will vote.

The 'Voting Delay' is currently 2 days and is not changed by this proposal. If this proposal passes, it will take ~1 week between proposal submission and the conclusion of voting.