Update gotify/server Docker tag to v2.6.0

Author: renovate-bot

apps/gotify/deployment.yaml

@@ -28,7 +28,7 @@ spec:
           type: "RuntimeDefault"
       containers:
         - name: "gotify"
-          image: "gotify/server:2.5.0"
+          image: "gotify/server:2.6.0"
           imagePullPolicy: "IfNotPresent"
           securityContext:
             runAsUser: 43444