Upgrade Rust to 1.74.0

[Zixing Liu]

Upgrade Rust to 1.74.0

Notable changes in 1.74:

- Linter configurations can now be specified in Cargo.toml
- Private Cargo registry can now request Cargo asking for authentication credentials from the user
- Compiler now allows `Self`and associated types in the return statement when the type is an opaque type

Release notes: https://blog.rust-lang.org/2023/11/16/Rust-1.74.0.html

[Zixing Liu (liushuyu-011)]

Preliminary packages have been uploaded to https://launchpad.net/~liushuyu-011/+archive/ubuntu/rust-updates-1.74/+packages.
The complete corresponding source can be found at https://git.launchpad.net/~canonical-foundations/ubuntu/+source/rustc/tree/?h=merge-1.74.

--------
Lintian report:
E: rustc source: field-too-long Vendored-Sources-Rust (11110 chars > 5000)
W: rustc source: mismatched-override missing-license-paragraph-in-dep5-copyright debian/copyright mpl-2.0+ [debian/source/lintian-overrides:15]
W: rustc source: missing-license-paragraph-in-dep5-copyright mpl-2.0+ [debian/copyright:2327]
W: rustc source: unknown-field Vendored-Sources-Rust
N: 0 hints overridden; 1 unused override
N: Some overrides were ignored.
N: Use --verbose for more information.
Finished running lintian.

-------

Autopkgtest reports:
https://autopkgtest.ubuntu.com/results/autopkgtest-mantic-liushuyu-011-rust-updates-1.74/?format=plain