Prop 139: Kava 13 Mainnet Upgrade

Objective
\Proposal to upgrade to Kava 13.

## Description

This proposal specifies that the Kava 13 upgrade will occur at block height 4,832,500 on May 17th, 2023, at approximately 15:00 UTC.

The release candidate & details for Kava 13 can be reviewed at: https://github.com/Kava-Labs/kava/releases/tag/v0.23.0

## Why is it needed?

This proposal includes updates to major dependencies and grants new powers for Kava DAO to manage community pool funds via the x/community module.

## Vote Yes

By voting yes, you agree to upgrade Kava to Kava 13.

## Vote No

By voting no, you disagree with upgrading Kava to Kava 13.