chore: (0.74) Update Mainnet throttles for CryptoGetAccountBalanceQuery (#25515)

Author: Neeharika-Sompalli

hedera-node/configuration/mainnet/upgrade/throttles.json

@@ -205,7 +205,7 @@
       "throttleGroups": [
         {
           "opsPerSec": 0,
-          "milliOpsPerSec": 20000000,
+          "milliOpsPerSec": 40000000,
           "operations": [
             "CryptoGetAccountBalance"
           ]