Replace deprecation warning with RuntimeError (GH-14397)

diff --git a/Lib/asyncio/streams.py b/Lib/asyncio/streams.py
index f03441b..204eaf7 100644
--- a/Lib/asyncio/streams.py
+++ b/Lib/asyncio/streams.py
@@ -1293,10 +1293,8 @@
                  is_server_side=False,
                  _asyncio_internal=False):
         if not _asyncio_internal:
-            warnings.warn(f"{self.__class__} should be instaniated "
-                          "by asyncio internals only, "
-                          "please avoid its creation from user code",
-                          DeprecationWarning)
+            raise RuntimeError(f"{self.__class__} should be instantiated "
+                               "by asyncio internals only")
         self._mode = mode
         self._transport = transport
         self._protocol = protocol