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

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

charts/stable/nzbget/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: NZBGet is a Usenet downloader client
 home: https://github.com/truecharts/apps/tree/master/charts/incubator/nzbget
@@ -20,4 +20,4 @@ name: nzbget
 sources:
 - https://nzbget.net/
 type: application
-version: 6.6.12
+version: 6.6.13