chore: update to latest lint set

[sagudev]

See linebender/peniko#143 for more info.

[DJMcNab]

Would you be willing to update the lib.rs lint sets to v4 whilst we're here - see https://linebender.org/wiki/canonical-lints/? The doc_auto_cfg is part of the lint set.

I'd be very surprised if that added any new warnings.

[sagudev]

Would you be willing to update the lib.rs lint sets to v4 whilst we're here - see https://linebender.org/wiki/canonical-lints/? The doc_auto_cfg is part of the lint set.

It's already done:

[DJMcNab]

Hmm, I clearly didn't express myself well enough - I was trying to ask you to update the lib.rs lint sets in this repository to v4, not the ones on the website. That was already done in linebender/linebender.github.io#123.
The lines which you're editing are part of the lint set block of this PR; they are outside the // END LINEBENDER LINT SET because of how rustfmt handles comments, binding them closely to the next attribute.

https://github.com/sagudev/color/blob/c34cb91626e99b57bd6e0e585cdc27dbba4856e8/color/src/lib.rs#L77-L84
Shows that this PR is still on v1, not v4.

[DJMcNab]

Thank you :)