Update all stable non-major dependencies

resources/chaosknoten/pretalx/docker_compose/compose.yaml.j2

@@ -15,7 +15,7 @@ services:
       - pretalx_net
 
   redis:
-    image: docker.io/library/redis:8.6.3
+    image: docker.io/library/redis:8.8.0
     restart: unless-stopped
     volumes:
       - redis:/data

resources/chaosknoten/tickets/docker_compose/compose.yaml.j2

@@ -13,7 +13,7 @@ services:
     restart: unless-stopped
 
   redis:
-    image: docker.io/library/redis:8.6.3
+    image: docker.io/library/redis:8.8.0
     ports:
       - "6379:6379"
     volumes: