fix: increase memory limit to 512Mi in app.yaml

Author: Starefossen

quotes-backend/.nais/app.yaml

@@ -49,7 +49,7 @@ spec:
     path: "/internal/prometheus"
   resources:
     limits:
-      memory: "256Mi"
+      memory: "512Mi"
     requests:
       cpu: "100m"
       memory: "128Mi"