PEP 719: Add the Python 3.13 release schedule PEP. (#3184)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

pep-0719.rst

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+PEP: 719
+Title: Python 3.13 Release Schedule
+Author: Thomas Wouters <thomas@python.org>
+Status: Active
+Type: Informational
+Topic: Release
+Content-Type: text/x-rst
+Created: 26-May-2023
+Python-Version: 3.13
+
+
+Abstract
+========
+
+This document describes the development and release schedule for
+Python 3.13.  The schedule primarily concerns itself with PEP-sized
+items.
+
+.. Small features may be added up to the first beta
+   release.  Bugs may be fixed until the final release,
+   which is planned for October 2024.
+
+
+Release Manager and Crew
+========================
+
+- 3.13 Release Manager: Thomas Wouters
+- Windows installers: Steve Dower
+- Mac installers: Ned Deily
+- Documentation: Julien Palard
+
+
+Release Schedule
+================
+
+3.13.0 schedule
+---------------
+
+Note: the dates below use a 17-month development period that results
+in a 12-month release cadence between feature versions, as defined by
+:pep:`602`.
+
+Actual:
+
+- 3.13 development begins: Monday, 2023-05-22
+
+Expected:
+
+- 3.13.0 alpha 1: Tuesday, 2023-10-17
+- 3.13.0 alpha 2: Tuesday, 2023-11-21
+- 3.13.0 alpha 3: Tuesday, 2023-12-19
+- 3.13.0 alpha 4: Tuesday, 2024-01-16
+- 3.13.0 alpha 5: Tuesday, 2024-02-13
+- 3.13.0 alpha 6: Tuesday, 2024-03-12
+- 3.13.0 alpha 7: Tuesday, 2024-04-09
+- 3.13.0 beta 1: Tuesday, 2024-05-07
+  (No new features beyond this point.)
+- 3.13.0 beta 2: Tuesday, 2024-05-28
+- 3.13.0 beta 3: Tuesday, 2024-06-18
+- 3.13.0 beta 4: Tuesday, 2024-07-16
+- 3.13.0 candidate 1: Tuesday, 2024-07-30
+- 3.13.0 candidate 2: Tuesday, 2024-09-03
+- 3.13.0 final: Tuesday, 2024-10-01
+
+Subsequent bugfix releases every two months.
+
+
+3.13 Lifespan
+-------------
+
+3.13 will receive bugfix updates approximately every 2 months for
+approximately 24 months. Around the time of the release of 3.15.0 final, the
+final 3.13 bugfix update will be released. After that, it is expected that
+security updates (source only) will be released until 5 years after the
+release of 3.13.0 final, so until approximately October 2029.
+
+
+Copyright
+=========
+
+This document is placed in the public domain or under the CC0-1.0-Universal
+license, whichever is more permissive.
+
+