There's a merged pull request on the void-packages repository

python3-flit_core: clean up bootstrapping
https://github.com/void-linux/void-packages/pull/43948

Description:
#### Testing the changes
- I tested the changes in this PR: **briefly**

@ahesford I found [this doc page](https://flit.pypa.io/en/stable/bootstrap.html) yesterday. I thought it might be beneficial to include in this package. Is it something you want for this template?