Upgrade to packaging 0.22

[rth]

Packaging v22.0 is released and we should upgrade to it. In particular, it removes the dependency on pyparsing which is great.

Currently, it doesn't work due to a regression in pypa/packaging#638 so we either need to wait for a new release with a fix, or patch

micropip/micropip/externals/pip/_vendor/pkg_resources.py

Line 417 in e33b73b

if not req.marker or req.marker.evaluate({"extra": extra}):

but patching the vendored version of pkg_resources is not great, because it means the extra argument to pass there depends on the packaging version (which can be different inside and outside Pyodide VM). So waiting for an upstream fix would be preferable.

[mentalisttraceur]

Re: "it removes the dependency on pyparsing": two micropip tests currently assume pyparsing is present:

micropip/tests/test_micropip.py

Line 235 in d02734b

await pyodide.loadPackage(["packaging", "pyparsing"]);

micropip/tests/test_micropip.py

Lines 337 to 343 in d02734b

	pyparsing_wheel_name = list(DIST_PATH.glob("pyparsing*.whl"))[0].name
	selenium.run_js(
	f"""
	await pyodide.runPythonAsync(`
	import micropip
	await micropip.install('file:{pyparsing_wheel_name}')
	import pyparsing

[ryanking13]

In particular, it removes the dependency on pyparsing which is great.

Great news! 🎉

[rth]

Yes, thanks @mentalisttraceur we would have to adapt those tests not to use pyparsing.

[rth]

Currently, it doesn't work due to a regression in pypa/packaging#638

This was fixed upstream, but we would need to wait for the 0.22.1 or 0.23.0 release

[arpitnath]

@rth When can we expect the 0.22.1 or 0.23.0 release?

[ryanking13]

We will release 0.22.1 when we address most of the bugs that are reported in 0.22.0.