Upgrade MongoDB image from 6.0 to 8.0 (#33579)

sharelatex  | The MongoDB server has version 6.0.27, but Overleaf requires at least version 8.0. Aborting.

COPYBARA_INTEGRATE_REVIEW=https://github.com/overleaf/overleaf/pull/1480 from noel-schenk:patch-1 4a13e4fbcdbc6c2683dc0595767426f40bf0093d

Co-authored-by: Noel Schenk <schenknoel@gmail.com>
GitOrigin-RevId: 9035d16f2c34edcb39c0da99e9d02b9ed8a9f6fa

docker-compose.yml

@@ -103,7 +103,7 @@ services:
 
   mongo:
     restart: always
-    image: mongo:6.0
+    image: mongo:8.0
     container_name: mongo
     command: "--replSet overleaf"
     volumes: