task queues: receive and send both now 20 concurrent

queue.yaml

@@ -22,7 +22,7 @@ queue:
 - name: receive
   target: default
   rate: 100/s
-  max_concurrent_requests: 5
+  max_concurrent_requests: 20
   retry_parameters:
     task_retry_limit: 2
     min_backoff_seconds: 300
@@ -31,7 +31,7 @@ queue:
 - name: send
   target: default
   rate: 100/s
-  max_concurrent_requests: 35
+  max_concurrent_requests: 20
   retry_parameters:
     task_retry_limit: 2
     min_backoff_seconds: 300