Automatic toolchain upgrade to nightly-2025-12-04

[github-actions]

Update Rust toolchain from nightly-2025-12-03 to nightly-2025-12-04 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@646a3f8 up to
rust-lang/rust@83e49b7. The log
for this commit range is:

https://github.com/rust-lang/rust/commit/83e49b75e7 Auto merge of #149591 - matthiaskrgr:rollup-b3zm9ke, r=matthiaskrgr

rust-lang/rust@2cc93b898b Rollup merge of #149590 - petrochenkov:norlld, r=mati865
rust-lang/rust@a2aa4f08da Rollup merge of #149541 - WaffleLapkin:never-test, r=lcnr
rust-lang/rust@49e31cc494 Rollup merge of #149532 - Amanieu:supertrait-shadowing-lints, r=lqd
rust-lang/rust@1d3d73ee5a Rollup merge of #149244 - spastorino:fix-mem-drop-rustdoc, r=ChrisDenton
rust-lang/rust@f6f7ddddd5 Rollup merge of #148918 - WaffleLapkin:tryfromwhattttt, r=jdonszelmann
rust-lang/rust@568b117627 Auto merge of #149555 - weihanglo:update-cargo, r=weihanglo
rust-lang/rust@388c42e72a linker: Remove special case for rust-lld in detect_self_contained_mingw
rust-lang/rust@8202d11051 Auto merge of #149581 - matthiaskrgr:rollup-w4dixyc, r=matthiaskrgr
rust-lang/rust@7432e9ed6c Rollup merge of #149578 - lapla-cogito:rustdoc_iterformat, r=notriddle
rust-lang/rust@7029f47452 Rollup merge of #149553 - BartMassey-upstream:aarch64-none-default-uwtables, r=wesleywiser
rust-lang/rust@45b2a711b1 Rollup merge of #148937 - joshtriplett:borrowed-buf-no-init-tracking, r=Amanieu
rust-lang/rust@672388edbe Auto merge of #149577 - ehuss:update-reference, r=ehuss
rust-lang/rust@880a779999 Update reference
rust-lang/rust@a4cfac7093 Auto merge of #149560 - matthiaskrgr:rollup-lce3baq, r=matthiaskrgr
rust-lang/rust@3b99d6b92e Rollup merge of #149538 - Ayush1325:uefi-fs-time-fix, r=joboet
rust-lang/rust@c67a7790e8 Rollup merge of #149520 - jdonszelmann:new-map-if, r=joboet
rust-lang/rust@02434fe718 Rollup merge of #148678 - xonx4l:EO412_replacement_with_EO425, r=Kivooeo
rust-lang/rust@9955b04971 Rollup merge of #148250 - hkBst:array-chunks-docs, r=joboet
rust-lang/rust@38d5d2877e Rollup merge of #146436 - hkBst:slice-iter-1, r=joboet