Bump for release

Author: sbidoul

NEWS.rst

@@ -9,6 +9,16 @@
 
 .. towncrier release notes start
 
+23.3.1 (2023-10-21)
+===================
+
+Bug Fixes
+---------
+
+- Handle a timezone indicator of Z when parsing dates in the self check. (`#12338 <https://github.com/pypa/pip/issues/12338>`_)
+- Fix bug where installing the same package at the same time with multiple pip processes could fail. (`#12361 <https://github.com/pypa/pip/issues/12361>`_)
+
+
 23.3 (2023-10-15)
 =================
 

news/12338.bugfix.rst

@@ -1,6 +1,6 @@
 from typing import List, Optional
 
-__version__ = "24.0.dev0"
+__version__ = "23.3.1"
 
 
 def main(args: Optional[List[str]] = None) -> int: