Rollup merge of #141071 - xizheyin:behind-upstream, r=Urgau

Enable [behind-upstream] triagebot option for rust-lang/rust

After testing in [rustc-develop-guide](https://github.com/rust-lang/rustc-dev-guide/pull/2384#issuecomment-2876631306), we can turn on `behind-upstream` here.

Doc: https://forge.rust-lang.org/triagebot/behind-upstream.html

r? ```@Urgau```
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León Orell Valerian Liehr 2025-05-18 11:03:46 +02:00 committed by GitHub
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