Update the URL for the requests package (GH-17006)

Change the url from docs.python-requests.org to requests.readthedocs.io
(cherry picked from commit 112f2b8)

Co-authored-by: Simon Legner <[email protected]>

Author: miss-islington

Doc/library/http.client.rst

@@ -20,7 +20,7 @@ HTTPS protocols.  It is normally not used directly --- the module
 
 .. seealso::
 
-    The `Requests package <http://docs.python-requests.org/>`_
+    The `Requests package <https://requests.readthedocs.io/en/master/>`_
     is recommended for a higher-level HTTP client interface.
 
 .. note::

Doc/library/urllib.request.rst

@@ -18,7 +18,7 @@ authentication, redirections, cookies and more.
 
 .. seealso::
 
-    The `Requests package <http://docs.python-requests.org/>`_
+    The `Requests package <https://requests.readthedocs.io/en/master/>`_
     is recommended for a higher-level HTTP client interface.