Reduce CPU and memory allocation in app.yaml (#3010)

Author: nikhilwoodruff

gcp/policyengine_api/app.yaml

@@ -1,8 +1,8 @@
 runtime: custom
 env: flex
 resources:
-  cpu: 4
-  memory_gb: 24
+  cpu: 2
+  memory_gb: 8
   disk_size_gb: 32
 automatic_scaling:
   min_num_instances: 1
@@ -26,4 +26,4 @@ readiness_check:
   timeout_sec: 30
   failure_threshold: 5
   success_threshold: 2
-  app_start_timeout_sec: 900
+  app_start_timeout_sec: 900