[Bug 2117513] Re: [needs-packaging] rustc-1.86

[Sebastien Bacher]

I've added rustc-1.86 to the questing whitelist now

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Title:
  [needs-packaging] rustc-1.86

Status in Ubuntu:
  In Progress
Status in The Questing Quokka:
  In Progress

Bug description:
  Rust 1.86 was released on 3 April, 2025. A great deal of packages in
  the Ubuntu archive rely on Rust to build properly, and as time passes,
  the minimal supported Rust version (MSRV) of crucial Rust-based
  packages increases.

  1.86 stabilizes several new APIs and language features. Additionally,
  `aarch64` is now optimized with ThinLTO and PGO, dramatically
  improving build times on that platform. See releases.rs[1] for a full
  changelog.

  In the 25.10 Roadmap, the target Rust version is 1.89, so the
  inclusion of `rustc-1.86` in the archive brings us one step closer to
  our goal.

  Source: https://github.com/rust-lang/rust/tree/1.86.0
  Licenses: Apache License v2.0 AND MIT License

  [1]: https://releases.rs/docs/1.86.0/

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