bpo-33503: Fix the broken pypi link in the source and the documentation (GH-6814)

diff --git a/Doc/distutils/setupscript.rst b/Doc/distutils/setupscript.rst
index 952607a..1d96acb 100644
--- a/Doc/distutils/setupscript.rst
+++ b/Doc/distutils/setupscript.rst
@@ -625,7 +625,7 @@
 
 (7)
     The valid classifiers are listed on
-    `PyPI <https://pypi.python.org/pypi?:action=list_classifiers>`_.
+    `PyPI <https://pypi.org/classifiers>`_.
 
 (8)
     To preserve backward compatibility, this field also accepts a string. If