Prepare for release 23.10.0 (#421)

Author: AlexWaygood

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Change Log
 
-## Unreleased
+## 23.10.0
 
 * Introduce Y090, which warns if you have an annotation such as `tuple[int]` or
   `Tuple[int]`. These mean "a tuple of length 1, in which the sole element is

pyi.py

@@ -37,7 +37,7 @@ def unparse(node: ast.AST) -> str:
     # and mypy thinks typing_extensions is part of the stdlib.
     from typing_extensions import Literal, TypeAlias, TypeGuard
 
-__version__ = "23.6.0"
+__version__ = "23.10.0"
 
 LOG = logging.getLogger("flake8.pyi")