Use bounded_stream for decompressor middleware

The behaviour of the `bounded_stream` property is stable among different
WSGI servers while the `stream` property might behave differently (see
https://falcon.readthedocs.io/en/stable/api/request_and_response_wsgi.html#falcon.Request.bounded_stream).

middleware/decompressor.py

@@ -20,7 +20,7 @@ def process_resource(self, req: falcon.Request, resp: falcon.Response, resource,
         if content_encoding == http_requests.EncodingMethod.GZIP:
             try:
                 decompressor = zlib.decompressobj(wbits=31)
-                data = decompressor.decompress(req.stream.read())
+                data = decompressor.decompress(req.bounded_stream.read())
             except Exception as e:
                 raise falcon.HTTPBadRequest(
                     title='Invalid gzip data',