PEP 693: Explicitly list 3.12's future patch release dates (#3624)

Spell out the schedule for future patch releases of 3.12 explicitly.

peps/pep-0693.rst

@@ -13,13 +13,7 @@ Abstract
 ========
 
 This document describes the development and release schedule for
-Python 3.12.  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 2023.
-
+Python 3.12.
 
 Release Manager and Crew
 ========================
@@ -29,7 +23,6 @@ Release Manager and Crew
 - Mac installers: Ned Deily
 - Documentation: Julien Palard
 
-
 Release Schedule
 ================
 
@@ -67,8 +60,21 @@ Actual:
 
 - 3.12.1: Thursday, 2023-12-07
 
-Subsequent bugfix releases every two months.
+Expected:
 
+- 3.12.2: Tuesday, 2024-02-06
+- 3.12.3: Tuesday, 2024-04-09
+- 3.12.4: Tuesday, 2024-06-04
+- 3.12.5: Tuesday, 2024-08-06
+- 3.12.6: Tuesday, 2024-10-01
+- 3.12.7: Tuesday, 2024-12-03
+- 3.12.8: Tuesday, 2025-02-04
+- 3.12.9: Tuesday, 2025-04-08
+
+Source-only security fix releases
+---------------------------------
+
+Provided irregularly on an as-needed basis until October 2028.
 
 3.12 Lifespan
 -------------