Upgrade Staking contract

[Zodomo]

Problem to Solve

The Staking.sol contract was updated. Once the Go infrastructure that utilizes it is updated to support the changes, the contract on Omni needs to be upgraded.

Proposed Solution

Wait for the related Go to be updated (see #2467), and then run the staking upgrade routine that was updated in PR #2465.

[Zodomo]

Because the validators are still whitelisted, we can upgrade the contract. The primary concern was validator pubkeys that didn't exist on the curve. The signature check is just to prevent frontrunning. We can upgrade again to remove the deprecated createValidator function once the e2e/cli code is updated.