fix(hetzner-robot): bump failover image to v1.2.0

v1.2.0 (obmondo/dockerfiles #54) makes the failover script assign the
floating IP to the node's public IP instead of its private hostIP, so
the Hetzner Robot failover reassignment targets the reachable address.

Author: ashish1099

argocd-helm-charts/hetzner-robot/values.yaml

@@ -1,7 +1,7 @@
 ---
 image:
   repository: ghcr.io/obmondo/hetzner-failover-script
-  tag: v1.1.0
+  tag: v1.2.0
 
 # Failover IP that pod will manage
 failoverIP: ""