Stabilize `PLR0917`

[flying-sheep]

I think it looks pretty stable, no?

[ntBre]

I think it does look pretty stable. Searching for related issues and PRs turns up a lot of results, but the ones I checked only referred to PLR0917 and didn't actually modify it. We should consider stabilizing it in the next minor release.

[MichaReiser]

Trying to remember what the reason was that we didn't stabilize the rules...

The only thing that comes to my mind is that we had concerns around various complexity rules (this is a one-off because it tries to approximate complexity by the number of positional arguments). That would explain why many of the other too-many rules haven't been stabilized. But I wasn't able to find any mention in notion. @AlexWaygood do you remember why we haven't stabilized this rule (it was added in 2023)