ci: test against pre-release versions of dependencies

[BorisMuzellec]

Reference Issue or PRs

Closes #170

What does your PR implement? Be specific.

Following @ivirshup's suggestion, this PR adds tests against pre-release versions of pydeseq2's dependencies to the CI.

[maikia]

I was not aware of the pip-flags: "--pre" but seems to be working well. What is the reasoning behind removing Python 3.11? I would prefer if we don't do it. for a reference the table of supported python versions.
Nevertheless, I approve and let you make the final decision

[BorisMuzellec]

Hi @maikia, thanks for having a look. Nice catch re python 3.11, it was not intentional. Let me add it back.

What do you think of removing support / tests for Python 3.8 though? In particular, recent releases of numpy are no longer supporting it.

[maikia]

In general, I support removing Python 3.8. Though it should be made clear as a lot of people are still using Python 3.8. Maybe you can release a new version which does not support 3.8 while the old ones (ie this one) still does?