Update coturn/coturn Docker tag to v4.6.1

This MR contains the following updates:

Package	Update	Change
coturn/coturn	minor	4.5.2 -> 4.6.1

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webserver/docker_coturn/templates/docker-compose.yml

@@ -3,7 +3,7 @@ version: "3"
 services:
 
   coturn:
-    image: coturn/coturn:4.5.2
+    image: coturn/coturn:4.6.1
     restart: always
     command:
       - turnserver