test: Python 3.14 compatibility update

tests/unit/__init__.py

@@ -1,3 +1,11 @@
+import asyncio
 from pytest_twisted import init_asyncio_reactor
 
+# FIXME: Python 3.14 compatibility fix, see libervia/backend/core/launcher.py for details.
+try:
+    asyncio.get_event_loop()
+except RuntimeError:
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+
 init_asyncio_reactor()