Bump Rust to 1.69.0

I ran into a problem compiling wasm-bindgen because the version of rust is too old:

error: package `time v0.3.20` cannot be built because it requires rustc 1.63.0 or newer, while the currently active rustc version is 1.60.0

Is it possible to bump it to the latest version rustc 1.69.0 (2023-04-16)?

changed title from Bump Rust to to Bump Rust to 1.69.0

@pierov @boklm does it seem reasonable to you to do this version bump after the 12.5 release/for the 13.0 alpha series?

Already done

But Rust is now at 1.70, and we should aim at it, since 1.69 has a problem with external LLVM tools (so, I'm injecting the patch that they didn't include in 1.69).

See https://gitlab.torproject.org/pierov/tor-browser-build/-/tree/bug_40855

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