deposit ui freezing

[0xtrooper]

Right now the cached "existing_deposits.json" was last updated at block 22673201. It is more then 6.1M blocks behind. Therefore the UI needs to fetch a lot of logs to update the pubkey list and validate a new deposit.
The way the "getPastLogs" function (use-deposit and use-dappnode-deposit) works, it create a lot of errors.

With each error thrown it has to re-fetch that chunk and it doubles the amount of async fetches. This made it impossible for me to deposit. Therefor the number of concurrent RPC calls should be limited.