Update redis:7.4.6-alpine Docker digest to 3b73847 (#692)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

searxng/docker-compose.yml

@@ -46,7 +46,7 @@ services:
 
   redis:
     container_name: redis
-    image: "redis:7.4.6-alpine@sha256:00fae95347ea570adeacfb295016865e1929f1155e09dbfe65261d081cba67ba"
+    image: "redis:7.4.6-alpine@sha256:3b73847e72874be07e6657b129a94761662b79bc0f679273757d4218573b2a98"
     command: redis-server --save "" --appendonly "no"
     restart: always
     tmpfs: