Update update_query calls to work with latest yarl

This patch pass "{}" when params is "None" to the url.update_query to
avoid setting the url params to None.

Related to this change in yarl:
aio-libs/yarl@dd86b34

Fix aio-libs#7259

aiohttp/client.py

@@ -374,6 +374,7 @@ async def _request(
         redirects = 0
         history = []
         version = self._version
+        params = params or {}
 
         # Merge with default headers and transform to CIMultiDict
         headers = self._prepare_headers(headers)
@@ -613,7 +614,7 @@ async def _request(
                             headers.pop(hdrs.AUTHORIZATION, None)
 
                         url = parsed_url
-                        params = None
+                        params = {}
                         resp.release()
                         continue