Update stateproof credentials to the new GCP keys in testnet-na

[nirbosl]

Description:

• Updated stateproof GCP credentials to match the new importer keys.

Related issue(s): https://github.com/swirlds/infrastructure/issues/6195

Notes for reviewer: The same changes for testnet-eu and citus were included in #8552

Checklist

• [x] Keys verified locally