[Bug 2039341] Re: rustc 1.70 and cargo 0.71 required by firefox 120

[Zixing Liu]

> requires rustc 1.70 and cargo 0.71 to build¹²

Note that in Ubuntu, since Rust 1.68, we have unified Rust packages with
rustc and cargo sharing the same version number from the upstream.

** Tags added: foundations-todo

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Title:
  rustc 1.70 and cargo 0.71 required by firefox 120

Status in cargo package in Ubuntu:
  New
Status in rustc package in Ubuntu:
  New

Bug description:
  Firefox 120+ requires rustc 1.70 and cargo 0.71 to build¹².

  The beta phase for Firefox 120.0 begins on 2023-10-23 and release
  candidates will be available from 2023-11-13.

  Eventually Thunderbird will need an updated rust toolchain as well.

  We will need these in all supported releases of Ubuntu: focal, jammy,
  lunar.

  ¹ https://bugzilla.mozilla.org/show_bug.cgi?id=1857172
  ² https://phabricator.services.mozilla.com/D190161

  Rust toolchain upgrades are usually relatively safe from a FTBFS point
  of view, since new releases are subjected to a crater run, crater
  being a tool that compiles the entirety of the crates.io packages.

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