chore(deps): update helm chart common to v6.8.4 (#792)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

charts/stable/unifi/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: auto
 dependencies:
 - name: common
   repository: https://truecharts.org/
-  version: 6.8.3
+  version: 6.8.4
 deprecated: false
 description: Ubiquiti Network's Unifi Controller
 home: https://github.com/truecharts/apps/tree/master/charts/incubator/unifi
@@ -21,4 +21,4 @@ sources:
 - https://github.com/jacobalberty/unifi-docker
 - https://unifi-network.ui.com
 type: application
-version: 6.6.12
+version: 6.6.13