STY: enforce RUF031 in pre-commit

[neutrinoceros]

A bit of background: this linting rule was implemented in ruff specifically because we requested it for usage in yt. I originally selected the rule at the global level, knowning it was still in "preview" (i.e. unstable) mode, which had no effect beyond triggering a warning, because I was expecting it would be stabilized soon after. This hasn't happened (yet), presumably for a lack of feedback.
Because the rule was tailored for an idiom very commonly seen in yt, I figure it would make sense that we beta-test the unstable (but so far, absolutely correct) implementation so we can later confidently ask it be marked stable without change.

refs:

• Remove parenthesis in getitem calls #4844
• FR: format (or lint with fix) getitem called with tuples litteral (e.g. a[(b, c)] -> a[b, c]) ? astral-sh/ruff#11990
• [ruff] Implement incorrectly-parenthesized-tuple-in-subscript (RUF031) astral-sh/ruff#12480

[neutrinoceros]

actually there might be some good reason (other than lack of feedback) for this rule to not be marked as stable yet:

• incorrectly-parenthesized-tuple-in-subscript (RUF031) - false positives with parenthesize-tuple-in-subscript = true on types outside of type annotations astral-sh/ruff#13065

(this shouldn't affect us though)

[matthewturk]

Thanks for doing this.