[Bug 2027639] [NEW] Upgrade Rust to 1.70.0

[Zixing Liu]

Public bug reported:

Upgrade Rust to 1.69.0.

Notable changes from upstream:

- OnceLock and OnceCell are now stabilized in the standard library. You no longer need to rely on an external crate for lazy initialized values.
- Sparse registry is now enabled by default. No more waiting on the crates index updates!
- std::io::IsTerminal is now stabilized in the standard library. Now you can determine whether a tty is attended without an external library!
- Many APIs in the networking space are stabilized in the standard library.

** Affects: rustc (Ubuntu)
     Importance: Undecided
     Assignee: Zixing Liu (liushuyu-011)
         Status: New

** Changed in: rustc (Ubuntu)
     Assignee: (unassigned) => Zixing Liu (liushuyu-011)

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https://bugs.launchpad.net/bugs/2027639

Title:
  Upgrade Rust to 1.70.0

Status in rustc package in Ubuntu:
  New

Bug description:
  Upgrade Rust to 1.69.0.

  Notable changes from upstream:

  - OnceLock and OnceCell are now stabilized in the standard library. You no longer need to rely on an external crate for lazy initialized values.
  - Sparse registry is now enabled by default. No more waiting on the crates index updates!
  - std::io::IsTerminal is now stabilized in the standard library. Now you can determine whether a tty is attended without an external library!
  - Many APIs in the networking space are stabilized in the standard library.

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