fix(sanic/tests): replace usage of response.stream

This function was removed in sanic [v22.6.0](sanic-org/sanic#2487).

We can just use ResponseStream directly.

tests/contrib/sanic/test_sanic.py

@@ -8,8 +8,8 @@
 from sanic.config import DEFAULT_CONFIG
 from sanic.exceptions import InvalidUsage
 from sanic.exceptions import ServerError
+from sanic.response import ResponseStream
 from sanic.response import json
-from sanic.response import stream
 from sanic.response import text
 from sanic.server import HttpProtocol
 
@@ -83,7 +83,7 @@ async def sample_streaming_fn(response):
             await response.write("foo,")
             await response.write("bar")
 
-        return stream(sample_streaming_fn, content_type="text/csv")
+        return ResponseStream(sample_streaming_fn, content_type="text/csv")
 
     @app.route("/error400")
     async def error_400(request):