feat(container): update image app-template to v2.6.0

[renovate]

This PR contains the following updates:

Package	Update	Change
app-template	minor	2.4.0 -> 2.6.0

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[github-actions]

--- kubernetes/apps/networking/echo-server/app Kustomization: flux-system/echo-server HelmRelease: networking/echo-server

+++ kubernetes/apps/networking/echo-server/app Kustomization: flux-system/echo-server HelmRelease: networking/echo-server

@@ -13,13 +13,13 @@

     spec:
       chart: app-template
       sourceRef:
         kind: HelmRepository
         name: bjw-s
         namespace: flux-system
-      version: 2.4.0
+      version: 2.6.0
   install:
     remediation:
       retries: 3
   interval: 30m
   maxHistory: 2
   uninstall: