Automatic toolchain upgrade to nightly-2026-01-03

[github-actions]

Update Rust toolchain from nightly-2026-01-02 to nightly-2026-01-03 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@fcd6309 up to
rust-lang/rust@85c8ff6. The log
for this commit range is:

https://github.com/rust-lang/rust/commit/85c8ff69cb Auto merge of #150606 - JonathanBrouwer:rollup-lue4jqz, r=JonathanBrouwer

rust-lang/rust@3dc296ad3a Rollup merge of #150594 - CieriA:patch-4, r=Mark-Simulacrum
rust-lang/rust@9c6a4b05bc Rollup merge of #150581 - Zalathar:string, r=Nadrieril
rust-lang/rust@1354000c37 Rollup merge of #150578 - CieriA:patch-1, r=Mark-Simulacrum
rust-lang/rust@8214b35cea Rollup merge of #150495 - androm3da:bcain/unwind_fix, r=Mark-Simulacrum
rust-lang/rust@58f5089d8a Rollup merge of #150444 - Sa4dUs:offload-intrinsic2, r=ZuseZ4
rust-lang/rust@51faf00dee Rollup merge of #150425 - Shunpoco:map-npm-install-error, r=Mark-Simulacrum
rust-lang/rust@5497a36a7f Auto merge of #149658 - Enselic:non-zero-opt, r=Mark-Simulacrum
rust-lang/rust@bfe591aac4 library: Fix typo in the documentatio of Cstring::from_vec_with_nul
rust-lang/rust@8a24a202aa Auto merge of #150534 - Kobzol:dist-test-rustdoc, r=Urgau
rust-lang/rust@58e2610f71 Expose workgroup/thread dims as intrinsic args
rust-lang/rust@bf6b5b9ded Auto merge of #150577 - wesleywiser:cleanup_debuginfo_compression, r=mati865
rust-lang/rust@1b4325211c Auto merge of #150582 - jhpratt:rollup-3mal3wc, r=jhpratt
rust-lang/rust@9c5bdbd960 Rollup merge of #150580 - CieriA:patch-3, r=jhpratt
rust-lang/rust@97050d4174 Rollup merge of #150445 - petrochenkov:keepscope, r=nnethercote
rust-lang/rust@57b2e6579a Rollup merge of #150073 - daxpedda:internal-unstable-asm-experimental-arch, r=nnethercote
rust-lang/rust@7749e75677 Split the cases for lowering string-equality and scalar-equality tests
rust-lang/rust@3c7c439812 Split out a separate PatConstKind::String
rust-lang/rust@d68c980c22 library: Document panic condition for Iterator::last
rust-lang/rust@91e169b1c9 Use clearer variable names in equality-test lowering
rust-lang/rust@a47f4dfd7f Auto merge of #150519 - camelid:mgca-forbid-params-properly, r=BoxyUwU
rust-lang/rust@a3e6de6e81 docs: fix typo in AsMut documentation
rust-lang/rust@f74896fc01 Cleanup debuginfo_compression unstable flag
rust-lang/rust@056908d7f4 Auto merge of #150575 - JonathanBrouwer:rollup-veh2d0h, r=JonathanBrouwer
rust-lang/rust@ecee483ff7 Rollup merge of #150568 - jieyouxu:triagebot-updates, r=Kivooeo
rust-lang/rust@ed5a529df1 Rollup merge of #150504 - AprilNEA:fix-99173, r=JonathanBrouwer
rust-lang/rust@745368c7d8 Rollup merge of #150431 - cyrgani:nfc-proc-macro-test, r=nnethercote
rust-lang/rust@21d3df6268 Rollup merge of #150382 - estebank:git-markers-wording, r=nnethercote