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

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

charts/stable/vaultwarden/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: auto
 dependencies:
 - name: common
   repository: https://truecharts.org/
-  version: 6.8.3
+  version: 6.8.4
 - condition: postgresql.enabled
   name: postgresql
   repository: https://truecharts.org/
@@ -31,4 +31,4 @@ name: vaultwarden
 sources:
 - https://github.com/dani-garcia/vaultwarden
 type: application
-version: 4.0.17
+version: 4.0.18