rust: use attribute expect

[jayvdb]

Changelog

Replace #[allow(..)] with #[expect(..)]

Docs

Description

The allow macro doesnt advise when it is no longer needed. The expect macro should always be used instead.

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[!NOTE] ^{Cursor Bugbot is generating a summary for commit 722e3423af6d5faa4cf18cb93d5ee750182d55c9. Configure here.}