MAINTAINERS: add Alice Ryhl as Rust reviewer

Alice has been involved with the Rust for Linux project for
almost a year now. She has been primarily working on the
Android Binder Driver [1].

In addition, she has been reviewing patches in the mailing
list for some months and has submitted improvements to the
core Rust support.

She is also part of the core maintainer team for the widely
used library Tokio [2], an asynchronous Rust runtime.

Her expertise with the language will be very useful to have
around in the future if Rust grows within the kernel, thus
add her to the `RUST` entry as reviewer.

Link: https://rust-for-linux.com/android-binder-driver [1]
Link: https://tokio.rs [2]
Acked-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20230718054521.1048785-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

MAINTAINERS

@@ -18555,6 +18555,7 @@ R:	Gary Guo <gary@garyguo.net>
 R:	Björn Roy Baron <bjorn3_gh@protonmail.com>
 R:	Benno Lossin <benno.lossin@proton.me>
 R:	Andreas Hindborg <a.hindborg@samsung.com>
+R:	Alice Ryhl <aliceryhl@google.com>
 L:	rust-for-linux@vger.kernel.org
 S:	Supported
 W:	https://github.com/Rust-for-Linux/linux