Windows CI jobs fail due to 403 error downloading Alpine Linux is setup-wsl step

[EliahKagan]

This step is recently failing in all Windows jobs:

GitPython/.github/workflows/pythonpackage.yml

Lines 52 to 58 in 22e0b52

	- name: Set up WSL (Windows)
	if: matrix.os-type == 'windows'
	uses: Vampire/setup-wsl@v6.0.0
	with:
	wsl-version: 1
	distribution: Alpine
	additional-packages: bash

It seems this may have first occurred in #2106. But it is not due to any changes there, as can be confirmed by rerunning the workflow. This resembles the old resolved issue Vampire/setup-wsl#77, but I'm not sure if the cause is actually related. I've opened a new issue Vampire/setup-wsl#82 for it.

I think we can solve this here by putting the distribution back to Debian (or Ubuntu). When doing so, the extra Alpine-specific code for installing bash should be removed. I'll do this unless some way of getting Alpine to work becomes apparent soon.