Prepare release 4.12.0 (#408)

CHANGELOG.md

@@ -1,4 +1,7 @@
-# Unreleased
+# Release 4.12.0 (May 23, 2024)
+
+This release is mostly the same as 4.12.0rc1 but fixes one more
+longstanding bug.
 
 - Fix incorrect behaviour of `typing_extensions.ParamSpec` on Python 3.8 and
   3.9 that meant that

CONTRIBUTING.md

@@ -61,24 +61,10 @@ may have installed.
 - Update the version number in `typing_extensions/pyproject.toml` and in
   `typing_extensions/CHANGELOG.md`.
 
-- Make sure your environment is up to date
-
- - `git checkout main`
- - `git pull`
- - `python -m pip install --upgrade build twine`
-
-- Build the source and wheel distributions:
-
-  - `rm -rf dist/`
-  - `python -m build .`
-
-- Install the built distributions locally and test (if you were using `tox`, you already
-  tested the source distribution).
-
-- Run `twine upload dist/*`. Remember to use `__token__` as the username
-  and pass your API token as the password.
-
 - Create a new GitHub release at https://github.com/python/typing_extensions/releases/new.
   Details:
   - The tag should be just the version number, e.g. `4.1.1`.
   - Copy the release notes from `CHANGELOG.md`.
+
+- Release automation will finish the release. You'll have to manually
+  approve the last step before upload.

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "flit_core.buildapi"
 # Project metadata
 [project]
 name = "typing_extensions"
-version = "4.12.0rc1"
+version = "4.12.0"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 readme = "README.md"
 requires-python = ">=3.8"