Rustup (#16791)

Remove internal lint DERIVE_DESERIALIZE_ALLOWING_UNKNOWN

Few small fixes for `clippy_dev/new_lint` (#16795)

clippy_dev/new_lint: sort imports in the snippet

clippy_dev/new_lint: fix path to the file where MSRVs reside

Bump nightly version -> 2026-04-02

Merge remote-tracking branch 'upstream/master' into rustup

Rollup merge of #154074 - dianne:dbg-temp-scopes, r=Mark-Simulacrum

update diagnostic for variables moved by `dbg!`

don't drop arguments' temporaries in `dbg!`

Add `manual_option_zip` lint (`a.and_then(|x| b.map(|y| (x, y)))`) (#16600)

impl manual_noop_waker lint (#16687)

impl manual_noop_waker lint

Issue #16110: similar_names not triggered by example (#16300)

Ran cargo dev fmt