chore(deps): update redis docker tag to v8

Author: renovate[bot]

modules/nixos/services/media/immich.nix

@@ -69,7 +69,7 @@ in
           };
 
           immich-redis.containerConfig = {
-            image = "redis:7.4";
+            image = "redis:8.0";
             pod = pods.immich-pod.ref;
           };
 

modules/nixos/services/penpot.nix

@@ -71,7 +71,7 @@ in
           dependsOn = [ "penpot-backend" ];
         };
         "penpot-redis".containerConfig = {
-          image = "redis:7-alpine";
+          image = "redis:8-alpine";
           pod = pods.${podName}.ref;
         };
         "penpot-db".containerConfig = {