Update pubgrub to d4795a31be17669aba11eb741b4a9086acc3eb11 (#3988)
I trimmed down the diff of our pubgrub fork with upstream and
[d4795a31be17669aba11eb741b4a9086acc3eb11](https://github.com/astral-sh/pubgrub/commit/d4795a31be17669aba11eb741b4a9086acc3eb11)
(diff:
https://github.com/pubgrub-rs/pubgrub/compare/dev...astral-sh:pubgrub:perma-35)
is the result.
