Bump `xattr` version to `0.10.0`. (#7005)

# Pull Request Check List

Resolves: #6928 

<!-- This is just a reminder about the most common mistakes. Please make
sure that you tick all *appropriate* boxes. But please read our
[contribution guide](https://python-poetry.org/docs/contributing/) at
least once, it will save you unnecessary review cycles! -->

- [ ] Added **tests** for changed code.
- [ ] Updated **documentation** for changed code.

<!-- If you have *any* questions to *any* of the points above, just
**submit and ask**! This checklist is here to *help* you, not to deter
you from contributing! -->

Bump `xattr` version to `0.10.0`.

This fixes #6891, which is not a problem with the user's environment as
suggested by the maintainer of xattr at xattr/xattr#108, but in fact the
problem of the package which was fixed by xattr/xattr#106.

Looking at the [changes in the version
bump](https://github.com/xattr/xattr/compare/v0.9.9...v0.10.0

), there
does not seem to be any significant changes other than shabang
xattr/xattr#106.

Co-authored-by: Moonsik Park <moonsik.park@estsoft.com>
Co-authored-by: Bartosz Sokorski <b.sokorski@gmail.com>