Bump toolchain to nightly-2023-03-10

We can almost use `stable`, except for requiring
`-Z no-unique-section-names=yes` to ensure that all symbols are located
in a single `.text` section (the Flipper Zero loader does not support
unique section names).

See rust-lang/rust#90275

crates/alloc/src/lib.rs

@@ -2,7 +2,6 @@
 //! *Note:* This currently requires using nightly.
 
 #![no_std]
-#![feature(alloc_error_handler)]
 
 use core::alloc::{GlobalAlloc, Layout};
 use core::ffi::c_void;
@@ -31,11 +30,3 @@ unsafe impl GlobalAlloc for FuriAlloc {
 
 #[global_allocator]
 static ALLOCATOR: FuriAlloc = FuriAlloc;
-
-#[alloc_error_handler]
-fn on_oom(_layout: Layout) -> ! {
-    unsafe {
-        sys::furi_thread_yield();
-        sys::crash!("Rust: Out of Memory");
-    }
-}

crates/flipperzero/Cargo.toml

@@ -6,7 +6,7 @@ repository = "https://github.com/dcoles/flipperzero-rs"
 readme = "../../README.md"
 license = "MIT"
 edition = "2021"
-rust-version = "1.64.0"
+rust-version = "1.68.0"
 autobins = false
 autotests = false
 autobenches = false

crates/rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2022-11-03"
+channel = "nightly-2023-03-10"
 targets = [ "thumbv7em-none-eabihf" ]