Automatic toolchain upgrade to nightly-2026-01-01

[github-actions]

Update Rust toolchain from nightly-2025-12-31 to nightly-2026-01-01 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@0e89999 up to
rust-lang/rust@8d670b9. The log
for this commit range is:

https://github.com/rust-lang/rust/commit/8d670b93d4 Auto merge of #150546 - JonathanBrouwer:rollup-jkqji1j, r=JonathanBrouwer

rust-lang/rust@552918bfcd Rollup merge of #150544 - bjorn3:run_make_print_target_libdir, r=Urgau,jieyouxu
rust-lang/rust@8dc15d2424 Rollup merge of #150543 - lnicola:sync-from-ra, r=lnicola
rust-lang/rust@15c467ba0c Rollup merge of #150530 - Zalathar:string-deref-patterns, r=jackh726
rust-lang/rust@f366fa5121 Rollup merge of #150337 - AsakuraMizu:main, r=jhpratt
rust-lang/rust@dc103c4cd9 Rollup merge of #146798 - a4lg:riscv-intrinsics-zkne_or_zknd, r=Amanieu
rust-lang/rust@a2bc948b7f Auto merge of #150542 - JonathanBrouwer:rollup-3fjgrji, r=JonathanBrouwer
rust-lang/rust@1a4e7f9aa9 Use --print target-libdir in run-make tests
rust-lang/rust@a7113d74eb Rollup merge of #150539 - Noratrieb:mark-it-down, r=ChrisDenton
rust-lang/rust@d898dccc21 Rollup merge of #150511 - Sa4dUs:offload-inline, r=ZuseZ4
rust-lang/rust@5183d8f15d Rollup merge of #150193 - Bryntet:parse_instruction_set, r=JonathanBrouwer
rust-lang/rust@4e90a96542 Corretly link URL in internal Windows docs
rust-lang/rust@2848c2ebe9 Auto merge of #147361 - saethlin:fallible-cycle-detection, r=oli-obk
rust-lang/rust@629b092f8f Auto merge of #150525 - weihanglo:update-cargo, r=weihanglo
rust-lang/rust@ef8d943ecd Remove feature(string_deref_patterns)
rust-lang/rust@cee7f5ed31 Add a regression test
rust-lang/rust@ab32c26b49 Auto merge of #150516 - Ayush1325:uefi-fs-readdir-fix, r=jhpratt
rust-lang/rust@74e0a9aa81 Make inliner cycle detection a fallible process
rust-lang/rust@94f8f4083e Auto merge of #150526 - JonathanBrouwer:rollup-j9hy7fm, r=JonathanBrouwer