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

resources/external/status/docker_compose/config/general.yaml

@@ -1,8 +1,6 @@
 storage:
   type: postgres
   path: "postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@database:5432/${POSTGRES_DB}?sslmode=disable"
-  maximum-number-of-results: 240 # Default are 100. 240 are 4h for 1m interval checks.
-  maximum-number-of-events: 1000 # Default are 50. Let's keep a long history here - 1000 should suffice for a year with around 3 events a day.
 
 ui:
   title: CCCHH Status