[Bug 2009920] Re: Upgrade Rust to 1.68.0

[Andrea Righi]

+1 on this, apparently we will need Rust 1.68 to provide the Rust
support in the kernel with linux 6.5 in mantic
(https://lore.kernel.org/lkml/20230618161558.1051269-1-ojeda@kernel.org/T/)

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Title:
  Upgrade Rust to 1.68.0

Status in rustc package in Ubuntu:
  In Progress

Bug description:
  Upgrade Rust to 1.68.0.

  Notable changes from upstream:

  - Cargo's sparse protocol: No longer need to wait through `git clone` for the crates index updates!
  - Local Pin construction: More advanced version of `tokio::pin!` macro.
  - Default alloc error handler: Now memory allocation failures no longer cause an abort()... only in the `no_std` builds though.

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