[3.15] gh-161212: Upgrade bundled pip to 26.3 (GH-161214) (#161219)

(cherry picked from commit 05486ac)

Co-authored-by: Damian Shaw <damian.peter.shaw@gmail.com>

Author: miss-islington

Lib/ensurepip/__init__.py

@@ -10,7 +10,7 @@
 
 
 __all__ = ["version", "bootstrap"]
-_PIP_VERSION = "26.2.2"
+_PIP_VERSION = "26.3"
 
 # Directory of system wheel packages. Some Linux distribution packaging
 # policies recommend against bundling dependencies. For example, Fedora

…pip/_bundled/pip-26.2.2-py3-none-any.whl …repip/_bundled/pip-26.3-py3-none-any.whlLib/ensurepip/_bundled/pip-26.2.2-py3-none-any.whl renamed to Lib/ensurepip/_bundled/pip-26.3-py3-none-any.whl Lib/ensurepip/_bundled/pip-26.2.2-py3-none-any.whl renamed to Lib/ensurepip/_bundled/pip-26.3-py3-none-any.whl

@@ -0,0 +1 @@
+Bump the version of :pypi:`pip` bundled in :mod:`ensurepip` to version 26.3.