[chore] Bump helm chart version to 6.8.8 (#261)

Author: jjlgao

charts/retool/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: retool
 description: A Helm chart for Kubernetes
 type: application
-version: 6.8.7
+version: 6.8.8
 maintainers:
   - name: Retool Engineering
     email: [email protected]