[Bug 2025691] Re: Upgrade Rust to 1.69.0

[Zixing Liu]

Hi Simon,

I have added the detailed explanation in the changelog and re-committed
the concerning commits with a new detailed commit message.

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Title:
  Upgrade Rust to 1.69.0

Status in rustc package in Ubuntu:
  In Progress

Bug description:
  Upgrade Rust to 1.69.0.

  Notable changes from upstream:

  - Cargo will now notify the user if the warnings are auto-fixable
  - Cargo now instructs the rustc to avoid generating debug information for build scripts
  - Several methods in `SocketAddr`, `SocketAddrV4` and `SocketAddV6` are now stable for const evaluation during the compile time

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