update image in kpo sample (GoogleCloudPlatform#2779)

* update image in kpo sample

* Specify req for py2

* Specify numpy for py2

Co-authored-by: Brad Miro <[email protected]>

Author: leahecole

composer/workflows/kubernetes_pod_operator.py

@@ -78,7 +78,7 @@
         # project-id as the gcr.io images and the service account that Composer
         # uses has permission to access the Google Container Registry
         # (the default service account has permission)
-        image='gcr.io/gcp-runtimes/ubuntu_16_0_4')
+        image='gcr.io/gcp-runtimes/ubuntu_18_0_4')
     # [END composer_kubernetespodoperator_minconfig]
     # [START composer_kubernetespodoperator_templateconfig]
     kubenetes_template_ex = kubernetes_pod_operator.KubernetesPodOperator(

composer/workflows/requirements.txt

@@ -1,4 +1,6 @@
 apache-airflow[gcp]==1.10.6
 kubernetes==10.0.1
-scipy==1.4.1
-numpy==1.17.4
+scipy==1.4.1; python_version > '3.0'
+scipy==1.2.3; python_version < '3.0'
+numpy==1.17.4; python_version > '3.0'
+numpy==1.16.6; python_version < '3.0'