Update docker.io/library/redis Docker tag to v8

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

@@ -2,7 +2,7 @@
 services:
 
   prometheus:
-    image: docker.io/prom/prometheus:v3.7.2@sha256:23031bfe0e74a13004252caaa74eccd0d62b6c6e7a04711d5b8bf5b7e113adc7
+    image: docker.io/prom/prometheus:v3.7.1@sha256:ff7e389acbe064a4823212a500393d40a28a8f362e4b05cbf6742a9a3ef736b2
     container_name: prometheus
     command:
       - '--config.file=/etc/prometheus/prometheus.yml'

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

@@ -23,7 +23,7 @@ services:
       - pretalx_net
 
   static:
-    image: docker.io/library/nginx:1.29.3@sha256:f547e3d0d5d02f7009737b284abc87d808e4252b42dceea361811e9fc606287f
+    image: docker.io/library/nginx:1.29.2@sha256:029d4461bd98f124e531380505ceea2072418fdf28752aa73b7b273ba3048903
     restart: unless-stopped
     volumes:
       - public:/usr/share/nginx/html