DEP: bump minimal requirements for iniconfig (1.0.0 -> 1.0.1) and packaging (20.0.0 -> 22.0.0)

[neutrinoceros]

This is a quick follow up to #13317 to make it even easier for downstream packages to test with uv's --resolution=lowest:

• iniconfig 1.0.1 has a wheel, while 1.0.0 doesn't. It currently builds fine, but using a wheel makes it even less likely to break in the future (for instance if setuptools breaks building 1.0.0)
• packaging 22.0.0 is the first zero-dependency version, which avoids any incompatibilities with its dependencies, most importantly including six, which I think is bound to break one day or another.

[neutrinoceros]

(No offense to six maintainers; this package served the community immensely and they cannot be thanked enough. I just think it outlasted its purpose and we should aim to get beyond it as the community leaves Python 2 behind)

[RonnyPfannschmidt]

Six was a godsend in the transition period

That period is over and its just right to finally gracefully retire that old companion its active purpose has been well served

[Pierre-Sassoulas]

F 😄