Python 3.13 is now main (#1099)

Author: hugovk

_static/devguide_overrides.css

@@ -69,6 +69,11 @@
     stroke: #008844;
 }
 
+.release-cycle-chart .release-cycle-blob.release-cycle-blob-prerelease {
+    fill: teal;
+    stroke: darkgreen;
+}
+
 .release-cycle-chart .release-cycle-blob.release-cycle-blob-feature {
     fill: #2222EE;
     stroke: #008888;

include/release-cycle.json

@@ -1,8 +1,16 @@
 {
-  "3.12": {
+  "3.13": {
     "branch": "main",
     "pep": 693,
     "status": "feature",
+    "first_release": "2024-10-07",
+    "end_of_life": "2029-10",
+    "release_manager": "Thomas Wouters"
+  },
+  "3.12": {
+    "branch": "3.12",
+    "pep": 693,
+    "status": "prerelease",
     "first_release": "2023-10-02",
     "end_of_life": "2028-10",
     "release_manager": "Thomas Wouters"

versions.rst

@@ -5,7 +5,7 @@
 Status of Python Versions
 =========================
 
-The main branch is currently the future Python 3.12, and is the only
+The ``main`` branch is currently the future Python 3.13, and is the only
 branch that accepts new features.  The latest release for each Python
 version can be found on the `download page <https://www.python.org/downloads/>`_.