Docker Compose remove deprecated version (#7309)

Minor doc

Docker/README.md

@@ -304,8 +304,6 @@ docker compose down --remove-orphans
 Detailed (partial) example of Docker Compose for FreshRSS:
 
 ```yaml
-version: "2.4"
-
 volumes:
   data:
   extensions:

docs/en/admins/16_OpenID-Connect-Authentik.md

@@ -101,8 +101,6 @@ OIDC_CLIENT_CRYPTO_KEY=???
 This is a full example docker-compose file. It uses Traefik reverse proxy, Authentik for OAuth.
 
 ```yaml
-version: "2.4"
-
 # you will need to define these volumes base on your setup
 volumes:
   freshrss-data: