chore(deps): update helm chart common to v6.8.0 (#759)

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

charts/stable/esphome/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: auto
 dependencies:
 - name: common
   repository: https://truecharts.org/
-  version: 6.7.0
+  version: 6.8.0
 deprecated: false
 description: ESPHome is a system to control your ESP8266/ESP32 by simple yet powerful
   configuration files and control them remotely through Home Automation systems.
@@ -24,4 +24,4 @@ sources:
 - https://github.com/esphome/esphome
 - https://hub.docker.com/u/esphome
 type: application
-version: 6.5.0
+version: 6.6.0