[2.7] bpo-33503: Fix the broken pypi link in the source and the documentation (GH-6814). (GH-6905)

(cherry picked from commit 19177fbd5d6d9b29ccc302d65f9d9417ece082ce)

Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>
diff --git a/Doc/library/re.rst b/Doc/library/re.rst
index c424230..228fcfe 100644
--- a/Doc/library/re.rst
+++ b/Doc/library/re.rst
@@ -35,7 +35,7 @@
 
 .. seealso::
 
-   The third-party `regex <https://pypi.python.org/pypi/regex/>`_ module,
+   The third-party `regex <https://pypi.org/project/regex/>`_ module,
    which has an API compatible with the standard library :mod:`re` module,
    but offers additional functionality and a more thorough Unicode support.