python-engineio: bump to 4.13.1

Changes since 4.5.1:
- v4.6+: Add support for WebTransport protocol
- v4.9+: Improved async task handling and cancellation
- v4.11.0: Required minimum for python-socketio 5.12+
- Various fixes for connection lifecycle and error handling

Also add test.sh to verify WSGI/ASGI app wrappers and server creation.

Link: https://github.com/miguelgrinberg/python-engineio/blob/main/CHANGES.md
Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-engineio/test.sh

@@ -0,0 +1,30 @@
+#!/bin/sh
+
+[ "$1" = "python3-engineio" ] || exit 0
+
+python3 - << EOF
+import sys
+
+# Verify key classes are importable
+from engineio import Server, AsyncServer, WSGIApp, ASGIApp
+
+# AsyncServer with asgi mode needs no external dependencies
+asrv = AsyncServer(async_mode='asgi')
+assert asrv is not None
+
+received = []
+
+@asrv.on("connect")
+async def on_connect(sid, environ):
+    received.append(("connect", sid))
+
+@asrv.on("disconnect")
+async def on_disconnect(sid):
+    received.append(("disconnect", sid))
+
+# ASGI app wrapper
+aapp = ASGIApp(asrv)
+assert aapp is not None
+
+sys.exit(0)
+EOF