Use get_running_loop() instead of deprecated get_event_loop()

src/mudlib/if_session.py

@@ -172,11 +172,12 @@ class IFSession:
 
         buf = b""
         idle_timeout = 0.1  # return quickly once data stops flowing
-        overall_deadline = asyncio.get_event_loop().time() + 5.0
+        loop = asyncio.get_running_loop()
+        overall_deadline = loop.time() + 5.0
 
         try:
             while True:
-                remaining = overall_deadline - asyncio.get_event_loop().time()
+                remaining = overall_deadline - loop.time()
                 if remaining <= 0:
                     break
                 timeout = min(idle_timeout, remaining)