[fix] piped engine - update backend_url list

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/settings.yml

@@ -1451,9 +1451,12 @@ engines:
     frontend_url: https://srv.piped.video
     # Instance will be selected randomly, for more see https://piped-instances.kavin.rocks/
     backend_url:
-      - https://pipedapi.kavin.rocks
-      - https://pipedapi-libre.kavin.rocks
       - https://pipedapi.adminforge.de
+      - https://pipedapi.nosebs.ru
+      - https://pipedapi.ducks.party
+      - https://pipedapi.reallyaweso.me
+      - https://api.piped.private.coffee
+      - https://pipedapi.darkness.services
 
   - name: piped.music
     engine: piped