Switch code style to stable release of Black

[hakonanes]

@harripj in #272:

The failing code style seems to be as a result of a new black release https://github.com/psf/black/releases which formats to remove the spaces around the power operator ** (see psf/black#2726). I can replicate the new behaviour on my machine by updating to black 21.1.0.

Black is no longer in a beta development state as of 9 days ago per the above referenced release notes, so I suggest we switch to this stable release. This means changing this line:

orix/.pre-commit-config.yaml

Line 3 in c7487dd

rev: 21.8b0

to 22.1.0, I believe.