Upgrade bundled pip to 22.1 series

[pradyunsg]

This is in the same vein as #91141. There has been a new pip release, and ensurepip's bundled wheels should be updated to the newer version of pip.

[pradyunsg]

Notably, due to pypa/pip#11044, Python 3.11+ can have a slightly different behaviour starting with pip 22.1 (it uses importlib.metadata instead of distutils/pkg_resources for loading metadata of installed packages).

[illia-v]

It will be nice if #31885 is merged before the upgrade to have a checksum of the pip wheel verified.

[stefanor]

FWIW, the 22.1 series doesn't work for ensurepip, yet (pypa/pip#11183)

[uranusjr]

There are a lot of layers compounding to the ultimate issue:

1. pkg_resources unconditionally ignores any metadata inside a sys.path item with suffix .whl. This ignore clause was originally intended for PKG-INFO metadata (according to in-code comments), but also got applied to .dist-info metadata without careful scrutiny.
2. importlib.metadata does not inherit this quirk.
3. ensurepip populates pip by running pip inside the wheel, a use case not supported by pip maintainers.
4. pip accidentally relied on the pkg_resources quirk to exclude itself from the installed packages, making installation process work.

So there are at least three ways we can fix this. But since running pip inside a wheel is not supported in the first place, I suggest changing ensurepip to not ship valid wheels, or pre-process them before running pip (matching how get-pip.py does this), which should resolve the issue. This also prevents people from getting a wrong idea from the stdlib, that pip actively supports being run inside a wheel.

[sbidoul]

22.2 is compatible with ensurepip (pypa/pip#11217).
So I filed #95194 and this issue can be closed.

[kumaraditya303]

Superseded by #95194