Update some Python libraries

[peterebden]

Fixing a warning about a missing licence and bringing some things more up to date. Tried a script or two locally and they still work.

I do wonder a little if we should drop all Python here and just do it all in Go, but it is sort of nice to illustrate that this is a multi-language build system.

[SpangleLabs]

Should we be marking the licences for the rest of these?

[peterebden]

Should we be marking the licences for the rest of these?

We don't generally in this repo. I only added it for that one because pip_library is emitting a warning about it.

[peterebden]

Should we be marking the licences for the rest of these?

We don't generally in this repo. I only added it for that one because pip_library is emitting a warning about it.

Hmmmm I've changed it to python_wheel (which seems better) but it still emits the warning. So I guess it's not pip_library but some property of the wheel metadata.

[peterebden]

Should we be marking the licences for the rest of these?

We don't generally in this repo. I only added it for that one because pip_library is emitting a warning about it.

Hmmmm I've changed it to python_wheel (which seems better) but it still emits the warning. So I guess it's not pip_library but some property of the wheel metadata.

For posterity, this is a newer format that we'll start supporting with please-build/python-rules#322