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

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

charts/stable/tvheadend/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: TVheadend - a TV streaming server and digital video recorder
 home: https://github.com/truecharts/apps/tree/master/charts/incubator/tvheadend
@@ -22,4 +22,4 @@ name: tvheadend
 sources:
 - https://github.com/tvheadend/tvheadend
 type: application
-version: 7.6.12
+version: 7.6.13