Add changelog for 2023.9

Author: hugovk

CHANGELOG.rst

@@ -2,6 +2,12 @@
 Changelog
 =========
 
+`2023.9 <https://github.com/python/python-docs-theme/releases/tag/v2023.9>`_
+----------------------------------------------------------------------------
+
+- Focus search box when pressing slash (#153)
+   Contributed by Hugo van Kemenade
+
 `2023.8 <https://github.com/python/python-docs-theme/releases/tag/v2023.8>`_
 ----------------------------------------------------------------------------
 

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "flit_core.buildapi"
 # project metadata
 [project]
 name = "python-docs-theme"
-version = "2023.8"
+version = "2023.9"
 description = "The Sphinx theme for the CPython docs and related projects"
 readme = "README.rst"
 urls.Code = "https://github.com/python/python-docs-theme"