DepositSnapshotResponse.finalized is incorrectly set to exactly three items

[prestonvanloon]

Looking at this API response object.

https://github.com/ethereum/beacon-APIs/blob/d2f846e0e0d551973253df4b5341655eddf92f1d/types/api.yaml#L3-L20

However, the EIP spec mentions the following:

Where finalized is a variable-length list (of maximum size DEPOSIT_CONTRACT_DEPTH) containing the hashes defined in the Deposit Finalization Flow section

Therefore the API definitions should be corrected:

• [ ] minItems should be 0
• [ ] maxItems should be 32 (DEPOSIT_CONTRACT_DEPTH)

cc @ethDreamer