chore: fix next-net dns (#24129)

Fix A-1240

Author: alexghr

spartan/environments/next-net.env

@@ -75,7 +75,7 @@ DEBUG_P2P_INSTRUMENT_MESSAGES=true
 
 RPC_GATEWAY_ENABLED=true
 RPC_GATEWAY_KONG_OTEL_METRICS_GCP_SECRET_NAME=otel-collector-url
-RPC_GATEWAY_HOSTS='["nextnet.aztec-labs.com"]'
+RPC_GATEWAY_HOSTS='["next-net.rpc.aztec-labs.com"]'
 RPC_GATEWAY_API_KEY_SECRET_NAMES='[]'
 RPC_GATEWAY_ALLOW_ANONYMOUS=true