chore: Bump rust-toolchain

Our version of Rust is severely out of date. This is not a problem but
now vscode's lsp starts to complain about it.

Failed to run proc-macro server from path /Users/jferge/.rustup/toolchains/1.74.1-aarch64-apple-darwin/libexec/rust-analyzer-proc-macro-srv, error: Custom { kind: Other, error: "The version of the proc-macro server (2) in your Rust toolchain is too old and no longer supported by your rust-analyzer which requiresversion 4 or higher.\nThis will prevent proc-macro expansion from working. Please consider updating your toolchain or downgrading your rust-analyzer to ensure compatibility with your current toolchain." }rust-analyzermacro-error

rust_snuba/rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.74.1"
+channel = "1.83.0"