Prepare release 4.8.0 (#283)

Author: JelleZijlstra

CHANGELOG.md

@@ -1,3 +1,7 @@
+# Release 4.8.0 (September 17, 2023)
+
+No changes since 4.8.0rc1.
+
 # Release 4.8.0rc1 (September 7, 2023)
 
 - Add `typing_extensions.Doc`, as proposed by PEP 727. Patch by

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "flit_core.buildapi"
 # Project metadata
 [project]
 name = "typing_extensions"
-version = "4.8.0rc1"
+version = "4.8.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 readme = "README.md"
 requires-python = ">=3.8"