tune SearXNG VPN request timeouts and retries

shared/searxng/settings.yml

@@ -21,13 +21,13 @@ valkey:
   url: "valkey://searxng-valkey:6379/0"
 
 outgoing:
-  request_timeout: 3.0
-  max_request_timeout: 10.0
+  request_timeout: 4.0
+  max_request_timeout: 12.0
   pool_connections: 100
   pool_maxsize: 20
   enable_http2: true
   keepalive_expiry: 5.0
-  retries: 3
+  retries: 1
 
 plugins:
   searx.plugins.unit_converter.SXNGPlugin: