chore(deps): update ghcr.io/fluxcd/notification-controller docker tag to v1.4.0

Author: renovate[bot]

cluster/base/flux-system/gotk-components.yaml

@@ -9627,7 +9627,7 @@ spec:
           valueFrom:
             fieldRef:
               fieldPath: metadata.namespace
-        image: ghcr.io/fluxcd/notification-controller:v1.2.4
+        image: ghcr.io/fluxcd/notification-controller:v1.4.0
         imagePullPolicy: IfNotPresent
         livenessProbe:
           httpGet: