FIX: misspelled taint in manifest (#121)

Co-authored-by: Kevin Klinger <[email protected]>

Author: Suse-KevinKlinger

manifests/system-upgrade-controller.yaml

@@ -65,7 +65,7 @@ spec:
         - key: "node-role.kubernetes.io/master"
           operator: "Exists"
           effect: "NoSchedule"
-        - key: "node-role.kubernetes.io/control-plane"
+        - key: "node-role.kubernetes.io/controlplane"
           operator: "Exists"
           effect: "NoSchedule"
         - key: "node-role.kubernetes.io/etcd"