[Bug 2109761] Re: Upgrade Rust to 1.85.1

[Jeremy Bícha]

I sponsored rustc-1.85 to questing. I believe we need it to build on all
architectures including i386 before we proceed with the rust-defaults
upload.

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Title:
  Upgrade Rust to 1.85.1

Status in rust-defaults package in Ubuntu:
  In Progress

Bug description:
  Rust 1.85 was released on 20 February 2025 and patched on 18 March
  2025. A great deal of packages in the Ubuntu archive rely on up-to-
  date versions of Rust in order to be built.

  Rust 1.85 comes with some significant additions, most notably the
  stabilization of the 2024 Edition.

  One example of a package relying on this update is rust-coreutils.
  rust-coreutils 0.1.0 is built using the Rust 2024 edition, so that
  update is reliant on 1.85 being available in the archive.

  More Info

  * Rust 2024 Edition: https://doc.rust-lang.org/nightly/edition-guide/rust-2024/index.html
  * Rust team blog post: https://blog.rust-lang.org/2025/02/20/Rust-1.85.0/
  * Detailed release notes: https://doc.rust-lang.org/stable/releases.html#version-1850-2025-02-20

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