Update node version

Author: bildungsroman

template.yaml

@@ -16,7 +16,7 @@ Resources:
         - ResourceName: deployFrontEnd
       CodeUri: src/deployFrontEnd
       Handler: index.handler
-      Runtime: nodejs8.10
+      Runtime: nodejs12.x
       MemorySize: 3008
       Timeout: 300
       Tracing: Active
@@ -79,7 +79,7 @@ Resources:
         - ResourceName: getWelcomePage
       CodeUri: src/getWelcomePage
       Handler: index.handler
-      Runtime: nodejs8.10
+      Runtime: nodejs12.x
       MemorySize: 3008
       Timeout: 30
       Tracing: Active