toolchain: Bump Rust to 1.80.0-nightly

Author: wyfcyx

os/.cargo/config renamed to os/.cargo/config.toml

@@ -19,6 +19,7 @@ pub struct TaskControlBlock {
 
 pub struct TaskControlBlockInner {
     pub trap_cx_ppn: PhysPageNum,
+    #[allow(unused)]
     pub base_size: usize,
     pub task_cx: TaskContext,
     pub task_status: TaskStatus,

os/src/task/task.rs

@@ -1,6 +1,6 @@
 [toolchain]
 profile = "minimal"
 # use the nightly version of the last stable toolchain, see <https://forge.rust-lang.org/>
-channel = "nightly-2024-01-18"
+channel = "nightly-2024-05-01"
 components = ["rust-src", "llvm-tools", "rustfmt", "clippy"]
-targets = ["riscv64gc-unknown-none-elf"]
+targets = ["riscv64gc-unknown-none-elf"]