Update validator configuration for staging environment

Author: alexghr

spartan/environments/staging-public.env

@@ -45,8 +45,8 @@ SEQ_L1_PUBLISHING_TIME_ALLOWANCE_IN_SLOT=36
 CREATE_ROLLUP_CONTRACTS=${CREATE_ROLLUP_CONTRACTS:-false}
 P2P_TX_POOL_DELETE_TXS_AFTER_REORG=true
 
-VALIDATOR_REPLICAS=2
-VALIDATORS_PER_NODE=128
+VALIDATOR_REPLICAS=4
+VALIDATORS_PER_NODE=64
 VALIDATOR_PUBLISHERS_PER_REPLICA=4
 VALIDATOR_PUBLISHER_MNEMONIC_START_INDEX=5000
 VALIDATOR_HA_REPLICAS=1