Bump for release

NEWS.rst

@@ -9,6 +9,31 @@
 
 .. towncrier release notes start
 
+21.3.1 (2021-10-22)
+===================
+
+
+Bug Fixes
+---------
+
+
+- Always refuse installing or building projects that have no ``pyproject.toml`` nor
+  ``setup.py``. (`#10531 <https://github.com/pypa/pip/issues/10531>`_)
+- Tweak running-as-root detection, to check ``os.getuid`` if it exists, on Unix-y and non-Linux/non-MacOS machines. (`#10565 <https://github.com/pypa/pip/issues/10565>`_)
+- When installing projects with a ``pyproject.toml`` in editable mode, and the build
+  backend does not support :pep:`660`, prepare metadata using
+  ``prepare_metadata_for_build_wheel`` instead of ``setup.py egg_info``. Also, refuse
+  installing projects that only have a ``setup.cfg`` and no ``setup.py`` nor
+  ``pyproject.toml``. These restore the pre-21.3 behaviour. (`#10573 <https://github.com/pypa/pip/issues/10573>`_)
+- Restore compatibility of where configuration files are loaded from on MacOS (back to ``Library/Application Support/pip``, instead of ``Preferences/pip``). (`#10585 <https://github.com/pypa/pip/issues/10585>`_)
+
+Vendored Libraries
+------------------
+
+
+- Upgrade pep517 to 0.12.0
+
+
 21.3 (2021-10-11)
 =================
 

news/10531.bugfix.rst

-Always refuse installing or building projects that have no ``pyproject.toml`` nor
-``setup.py``.

news/10565.bugfix.rst

-Tweak running-as-root detection, to check ``os.getuid`` if it exists, on Unix-y and non-Linux/non-MacOS machines.

news/10573.bugfix.rst

-When installing projects with a ``pyproject.toml`` in editable mode, and the build
-backend does not support :pep:`660`, prepare metadata using
-``prepare_metadata_for_build_wheel`` instead of ``setup.py egg_info``. Also, refuse
-installing projects that only have a ``setup.cfg`` and no ``setup.py`` nor
-``pyproject.toml``. These restore the pre-21.3 behaviour.

news/10585.bugfix.rst

-Restore compatibility of where configuration files are loaded from on MacOS (back to ``Library/Application Support/pip``, instead of ``Preferences/pip``).

news/pep517.vendor.rst

-Upgrade pep517 to 0.12.0

src/pip/__init__.py

 from typing import List, Optional
 
-__version__ = "21.3"
+__version__ = "21.3.1"
 
 
 def main(args: Optional[List[str]] = None) -> int: