Add a due date on the deprecation.

Author: jaraco

newsfragments/+99b1cfb7.feature.rst

@@ -0,0 +1 @@
+Added a deadline of Oct 31 to the setup.py install deprecation.

setuptools/command/install.py

@@ -63,9 +63,7 @@ def initialize_options(self):
             standards-based tools.
             """,
             see_url="https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html",
-            # TODO: Document how to bootstrap setuptools without install
-            #       (e.g. by unzipping the wheel file)
-            #       and then add a due_date to this warning.
+            due_date=(2025, 10, 31),
         )
 
         super().initialize_options()