Fix podman configuration

Podman binds `host.containers.internal` to public ip. So setting the
localhost by hand in the autobahn fuzzingclient configuration makes
possible to run the actix server on localhost.

websockets/autobahn/config/fuzzingclient-podman.json

@@ -3,7 +3,7 @@
   "servers": [
     {
       "agent": "actix-web-actors",
-      "url": "ws://host.containers.internal:9001"
+      "url": "ws://127.0.0.1:9001"
     }
   ],
   "cases": ["*"],

websockets/autobahn/src/main.rs

@@ -15,7 +15,7 @@ async fn main() -> std::io::Result<()> {
             .service(web::resource("/").route(web::get().to(websocket::index)))
     })
     .workers(2)
-    .bind(("0.0.0.0", 9001))?
+    .bind(("127.0.0.1", 9001))?
     .run()
     .await
 }