Geode: Update build slave to Ubutnu 20.04

Change-Id: Id07452266f9ce32c0335d1d465e4865b2f5e8257
diff --git a/jjb/geode-native/global-template-apache-geode-native-test.yaml b/jjb/geode-native/global-template-apache-geode-native-test.yaml
index 7b18c77..b5a7868 100644
--- a/jjb/geode-native/global-template-apache-geode-native-test.yaml
+++ b/jjb/geode-native/global-template-apache-geode-native-test.yaml
@@ -20,7 +20,7 @@
 - job-template:
     name: 'apache-geode-native-{test-type}'
 
-    node: geode-ubuntu1804
+    node: geode-ubuntu2004
     disabled: false
     concurrent: true