Update rust version

[jaudiger]

Follow up of brioche-dev/brioche#363

[jaudiger]

Interesting with latest Rust nightly, we're now getting a build error:

error: panic_immediate_abort is now a real panic strategy! Enable it with `panic = "immediate-abort"` in Cargo.toml, or with the compiler flags `-Zunstable-options -Cpanic=immediate-abort`. In both cases, you still need to build core, e.g. with `-Zbuild-std`
  --> /home/runner/.rustup/toolchains/nightly-2025-11-01-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/panicking.rs:36:1
   |
36 | / compile_error!(
37 | |     "panic_immediate_abort is now a real panic strategy! \
38 | |     Enable it with `panic = \"immediate-abort\"` in Cargo.toml, \
39 | |     or with the compiler flags `-Zunstable-options -Cpanic=immediate-abort`. \
40 | |     In both cases, you still need to build core, e.g. with `-Zbuild-std`"
41 | | );
   | |_^

For more information, see the Rust issue tracking immediate-abort flag. Since I don't want to support both way to do it as Microsoft did here. I'll rollback nightly before this PR was merged. And we'll wait Rust 1.92 to properly solve it (if something is required on our side).

[kylewlacy]

LGTM

Well, glad immediate-abort is going to be stabilized soon!