PEP 763: add withdrawal notice

Signed-off-by: William Woodruff <william@astral.sh>

Author: woodruffw

peps/pep-0763.rst

@@ -12,6 +12,18 @@ Created: 24-Oct-2024
 Post-History: `09-Jul-2022 <https://discuss.python.org/t/17227>`__,
               `01-Oct-2024 <https://discuss.python.org/t/66351>`__,
               `28-Oct-2024 <https://discuss.python.org/t/69487>`__
+Resolution: `21-Sep-2025 <https://discuss.python.org/t/69487/38>`__
+
+
+PEP Withdrawal
+==============
+
+This PEP has been withdrawn as of 22-Sep-2025.
+
+During discussion of the PEP, it became clear that a PEP is not necessarily
+the appropriate venue for changes to PyPI's deletion policy, as
+PyPI's usage policies are not presently (or necessarily should) be part of the
+PEP process.
 
 Abstract
 ========