Update Helm release terrakube to v4.7.6 (#166)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

infra/argo-apps/terrakube.yaml

@@ -11,7 +11,7 @@ spec:
       targetRevision: HEAD
       ref: myRepo
     - repoURL: https://terrakube-io.github.io/terrakube-helm-chart
-      targetRevision: 4.7.5
+      targetRevision: 4.7.6
       chart: terrakube
       helm:
         valueFiles: