chore(deps): update helm chart common to v8.15.0 (#1859)

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

charts/stable/kanboard/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 appVersion: "1.2.21"
 description: Kanboard is a free and open source Kanban project management software.
 name: kanboard
-version: 5.0.30
+version: 5.0.31
 kubeVersion: ">=1.16.0-0"
 keywords:
 - kanboard
@@ -14,7 +14,7 @@ sources:
 dependencies:
 - name: common
   repository: https://truecharts.org
-  version: 8.14.5
+  version: 8.15.0
 - condition: postgresql.enabled
   name: postgresql
   repository: https://truecharts.org/