switch default aws region to eu-central-1 (cleanup job)

Change-Id: I81883cb2b9084c43020f2eedb7491f6bbf5e4beb
diff --git a/jenkins/client/job/deploy/lab/cleanup.yml b/jenkins/client/job/deploy/lab/cleanup.yml
index 3f3875f..0db6463 100644
--- a/jenkins/client/job/deploy/lab/cleanup.yml
+++ b/jenkins/client/job/deploy/lab/cleanup.yml
@@ -59,7 +59,7 @@
               default: "aws-credentials"
             AWS_DEFAULT_REGION:
               type: string
-              default: "us-west-2"
+              default: "eu-central-1"
 
         delete-failed-stacks:
           type: workflow-scm