Update container port from 3000 to 50051 in sample k8s config (#640)

* Update container port from 3000 to 50051 in sample k8s config
Signed-off-by: Anindita Das <dasanuiit@gmail.com>

Signed-off-by: Anindita Das <dasanuiit@gmail.com>

* Update container port from 3000 to 50051 in sample k8s config
Signed-off-by: Anindita Das <dasanuiit@gmail.com>

---------

Signed-off-by: Anindita Das <dasanuiit@gmail.com>
Co-authored-by: Anindita Das <anindita.das@ibm.com>
Co-authored-by: Bernd Verst <github@bernd.dev>

Author: 3 people

examples/grpc_proxying/deploy/invoke-receiver.yaml

@@ -36,5 +36,5 @@ spec:
         command: ["python"]
         args: ["/app/invoke-receiver.py"]
         ports:
-        - containerPort: 3000
+        - containerPort: 50051
         imagePullPolicy: Always