Bump the patch level version of distutils since there were a few bug fixes
since the 2.5.0 release.

Backport of r54615.
diff --git a/Lib/distutils/__init__.py b/Lib/distutils/__init__.py
index 21d34c7..86ad44f 100644
--- a/Lib/distutils/__init__.py
+++ b/Lib/distutils/__init__.py
@@ -20,4 +20,4 @@
 # In general, major and minor version should loosely follow the Python
 # version number the distutils code was shipped with.
 #
-__version__ = "2.5.0"
+__version__ = "2.5.1"