DEP: drop support for CPython 3.8

[neutrinoceros]

Following my recent email, closes #4302

[neutrinoceros]

@yt-fido test this please

[neutrinoceros]

@yt-fido test this please

[neutrinoceros]

@yt-fido test this please

[neutrinoceros]

@yt-fido test this please

[neutrinoceros]

@yt-fido test this please

[neutrinoceros]

@yt-fido test this please

[cphyc]

LGTM, thanks for the hard work! For reference, could you comment on the upgrades required to make nose work?

[neutrinoceros]

@cphyc As far as I know nose is just patched as follow

python3.10 -m pip install nose nose-exclude
find .venv/lib/python*/site-packages/nose -name "*.py" -exec sed -i -e 's/collections.Callable/collections.abc.Callable/g' {} \;

see #4302 (comment)
Maybe @Xarthisius has more insight on this.

[Xarthisius]

@cphyc As far as I know nose is just patched as follow

python3.10 -m pip install nose nose-exclude
find .venv/lib/python*/site-packages/nose -name "*.py" -exec sed -i -e 's/collections.Callable/collections.abc.Callable/g' {} \;

see #4302 (comment) Maybe @Xarthisius has more insight on this.

That's everything I did.