Automatic toolchain upgrade to nightly-2026-04-02

[github-actions]

Update Rust toolchain from nightly-2026-04-01 to nightly-2026-04-02 without any other source changes.

[github-actions]

This is an automatically generated pull request. If any of the CI checks fail,
manual intervention is required. In such a case, review the changes at
https://github.com/rust-lang/rust from
rust-lang/rust@48cc71e up to
rust-lang/rust@7e46c5f. The log
for this commit range is:

https://github.com/rust-lang/rust/commit/7e46c5f6fb Auto merge of #154292 - Zalathar:def-kind, r=petrochenkov

rust-lang/rust@2bd7a97871 Auto merge of #154668 - jhpratt:rollup-ePnl7Di, r=jhpratt
rust-lang/rust@7f794c3463 Rollup merge of #154655 - chenyukang:yukang-fix-145586-deserializer-bound-syntax, r=jieyouxu
rust-lang/rust@1fb655c590 Rollup merge of #154647 - folkertdev:avr-c_double-f32, r=tgross35
rust-lang/rust@6bbf210432 Rollup merge of #154641 - lolbinarycat:fix-yarn-locking, r=GuillaumeGomez,jieyouxu
rust-lang/rust@60e85c7ec3 Rollup merge of #154356 - joshtriplett:libs-api-integer-truncate-extend, r=jhpratt
rust-lang/rust@3ebe60c8c3 Auto merge of #154659 - chenyukang:rollup-D1UvH9O, r=chenyukang
rust-lang/rust@18f8cd2c28 Rollup merge of #154648 - nnethercote:clarify-ty-List, r=cuviper
rust-lang/rust@9344df3cdb Rollup merge of #154643 - AdinAck:fix-pin-docs, r=chenyukang
rust-lang/rust@1f5dcf30d7 Rollup merge of #154592 - reddevilmidzy:lifetime, r=chenyukang
rust-lang/rust@8296e03d86 Rollup merge of #153207 - devnexen:net_set_linger_fix, r=Amanieu
rust-lang/rust@9445be9bf5 Rollup merge of #152935 - folkertdev:c-variadic-disallow, r=tgross35
rust-lang/rust@12ab1cf1fd Auto merge of #154456 - chenyukang:yukang-fix-154434-unused-assignments, r=estebank
rust-lang/rust@700cfa8c93 Auto merge of #154649 - JonathanBrouwer:rollup-3KmleSY, r=JonathanBrouwer

[feliperodri]

Closing this one in favor of #4755