Automatic toolchain upgrade to nightly-2025-10-16

[github-actions]

Update Rust toolchain from nightly-2025-10-15 to nightly-2025-10-16 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@844264a up to
rust-lang/rust@57ef8d6. The log
for this commit range is:

https://github.com/rust-lang/rust/commit/57ef8d642d Auto merge of #144064 - davidtwco:prefer-alias-over-env-for-sizedness, r=lcnr

rust-lang/rust@3f2a5921a4 Auto merge of #147730 - Muscraft:update-cargo, r=Muscraft
rust-lang/rust@b5906362dd Update cargo
rust-lang/rust@28d0a4a205 Auto merge of #143548 - Diggsey:db-limit-extern-crate-usage, r=oli-obk
rust-lang/rust@4f08307f6e Auto merge of #147619 - nnethercote:union-ne-check, r=Zalathar
rust-lang/rust@519d6cd364 core: relax supertrait of Destruct
rust-lang/rust@676d9cfa8b trait_sel: prefer only nested alias bounds
rust-lang/rust@c50aebba78 trait_sel: don't require predicates of aliases hold
rust-lang/rust@321a47eb2c trait_sel: sizedness goals prefer alias candidates
rust-lang/rust@efaeacfc96 revert: PR144016 - MetaSized does not always hold
rust-lang/rust@5413f7d39c Auto merge of #147715 - matthiaskrgr:rollup-611b4x4, r=matthiaskrgr
rust-lang/rust@ed6077ab18 Rollup merge of #147711 - saethlin:GlobalAlloc-safety, r=Amanieu
rust-lang/rust@6f6a1ce4d8 Rollup merge of #147706 - madsmtm:review-rotation, r=chenyukang
rust-lang/rust@e389ffa763 Rollup merge of #147699 - aDotInTheVoid:doc-comment-doc-comment, r=jdonszelmann
rust-lang/rust@72030511bb Rollup merge of #147685 - jdonszelmann:deprecated-no-span, r=JonathanBrouwer
rust-lang/rust@33b1e92d4f Rollup merge of #147539 - petrochenkov:cmresolve, r=eholk
rust-lang/rust@041ecb124a Rollup merge of #146949 - pmur:murp/improve-ppc-inline-asm, r=Amanieu
rust-lang/rust@8509756f46 Rollup merge of #146841 - bjoernager:const-slice-rotate, r=Amanieu
rust-lang/rust@60481827f6 Add a != check to ChunkedBitSet::union.
rust-lang/rust@facb9aca79 Refactor some ChunkedBitSet operations.
rust-lang/rust@efd7c8dd61 Add myself (madsmtm) to review rotation
rust-lang/rust@235a4c083e Auto merge of #147692 - matthiaskrgr:rollup-bqhlwyw, r=matthiaskrgr

[tautschnig]

I am not sure whether the Python/brew issue is an issue in Kani's setup, Homebrew, or github runner images. Homebrew/homebrew-core#248654 is in progress, which could be related. Let's wait for a couple of hours to see whether others run into this.