Fix "There is no current event loop" in the asyncio test

This bug is causing the test to fail under Python 3.14. Fix it by
calling asyncio.new_event_loop() and asyncio.set_event_loop() as
recommended in: https://stackoverflow.com/a/73367187

Fixes #197

irc/tests/test_client_aio.py

@@ -1,6 +1,4 @@
 import asyncio
-import contextlib
-import warnings
 from unittest.mock import MagicMock
 
 from irc import client_aio
@@ -13,21 +11,14 @@ async def mock_create_connection(*args, **kwargs):
     return mock_create_connection
 
 
-@contextlib.contextmanager
-def suppress_issue_197():
-    with warnings.catch_warnings():
-        warnings.filterwarnings('ignore', 'There is no current event loop')
-        yield
-
-
 def test_privmsg_sends_msg():
     # create dummy transport, protocol
     mock_transport = MagicMock()
     mock_protocol = MagicMock()
 
     # connect to dummy server
-    with suppress_issue_197():
-        loop = asyncio.get_event_loop()
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
     loop.create_connection = make_mocked_create_connection(
         mock_transport, mock_protocol
     )