fix: revert redis version 8 and ensure no major update

Author: tcarmet

.github/dependabot.yaml

@@ -24,6 +24,8 @@ updates:
       # Same story for utapi
       - dependency-name: "scality/utapi"
         update-types: ["version-update:semver-major"]
+      - dependency-name: "redis"
+        update-types: ["version-update:semver-major"]
     groups:
       docker:
         patterns:

templates/global/values.yaml

@@ -41,7 +41,7 @@ zookeeper:
   image: bitnami/zookeeper:3.9.3
 
 redis:
-  image: redis:8
+  image: redis:7
 
 utapi:
   image: ghcr.io/scality/utapi:7.70.9