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

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

charts/stable/collabora-online/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: "Collabora Online Development Edition \u2013 an awesome, Online Office\
   \ suite image suitable for home use."
@@ -25,4 +25,4 @@ sources:
 - https://sdk.collaboraonline.com/contents.html
 - https://github.com/CollaboraOnline/online/tree/master/kubernetes/helm
 type: application
-version: 6.6.14
+version: 6.6.15