Fix imports for sanic v21.9.0 and up

examples/server/sanic/requirements.txt

@@ -1,7 +1,8 @@
-aiofiles==0.3.0
-httptools==0.0.9
-python_engineio
-sanic==0.3.1
-six==1.10.0
-ujson==1.35
-uvloop==0.8.0
+aiofiles==0.8.0
+httptools==0.3.0
+multidict==5.2.0
+sanic==21.12.0
+sanic-routing==0.7.2
+ujson==5.1.0
+uvloop==0.16.0
+websockets==10.1

src/engineio/async_drivers/sanic.py

@@ -3,7 +3,11 @@
 
 try:  # pragma: no cover
     from sanic.response import HTTPResponse
-    from sanic.websocket import WebSocketProtocol
+    try:
+        from sanic.server.protocols.websocket_protocol import WebSocketProtocol
+    except ImportError:
+        print('yay')
+        from sanic.websocket import WebSocketProtocol
 except ImportError:
     HTTPResponse = None
     WebSocketProtocol = None