chore(deps): update mbentley/omada-controller docker tag to v5.15.8.2

Author: renovate[bot]

applications/omada-controller/values.yaml

@@ -7,7 +7,7 @@ controllers:
         image:
           repository: mbentley/omada-controller
           pullPolicy: IfNotPresent
-          tag: 5.15.6.7
+          tag: 5.15.8.2
 
         env:
           - name: MANAGE_HTTP_PORT