Update PEP 602 with 2 years of full support of Python 3.13+

peps/pep-0602.rst

@@ -9,6 +9,7 @@ Status: Accepted
 Type: Informational
 Content-Type: text/x-rst
 Created: 04-Jun-2019
+Post-History: 9-Oct-2023
 Python-Version: 3.9
 
 
@@ -44,22 +45,28 @@ This PEP proposes that Python 3.X.0 will be developed for around
   if necessary) and conclude with the release of the final release of
   Python 3.X.0.
 
-1½ year of full support, 3½ more years of security fixes
+2 years of full support, 3 more years of security fixes
---------------------------------------------------------
+-------------------------------------------------------
 
 After the release of Python 3.X.0, the 3.X series is maintained for
 five years:
 
-- During the *first eighteen months* (1½ year) it receives bugfix
+- During the *first twenty four months* (2 years) it receives bugfix
   updates and full releases (sources and installers for Windows and
   macOS) are made approximately every other month.
 
-- For the next *forty two months* (3½ years) it receives security
+- For the next *thirty six months* (3 years) it receives security
   updates and source-only releases are made on an as-needed basis
   (no fixed cadence).
 
 - The final source-only release is made *five years* after 3.X.0.
 
+Note: 2 years of full support start with
+`Python 3.13 <https://peps.python.org/pep-0719/>`_.  Python versions
+3.9 - 3.12 operate on a calendar with 1½ year of full support, followed
+by 3½ more years of security fixes.
+
+
 Annual release cadence
 ----------------------