Do not force the numba threading layer

[tmillenaar]

Minimal change to address #159

[HannoSpreeuw]

CI broke, probably because of an issue with hatch when issuing

hatch run lint:flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
hatch run lint:flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

This bug has been reported in the hatch repo
Twice actually, here two workarounds have been suggested.

[tmillenaar]

Apparently it is a known issue with Hatch and Click v8.3.0:
pypa/hatch#2050
They are looking at a hotfix for click it seems:
pallets/click#3068

[tmillenaar]

I made a temporary fix in this PR:
#161

We can either merge that and rebase this branch to include the fix or we can wait out the click patch release.

[HannoSpreeuw]

We can either merge that and rebase this branch to include the fix

I'd go for that.

[HannoSpreeuw]

Thanks for this fix!