build(msrv): ⬆️ bump MSRV since Rust 1.81 was released

Features from Rust 1.79 can be used now.Notable features from [Rust 1.79](https://releases.rs/docs/1.79.0/):

- Stabilize inline `const {}` expressions.
- Stabilize `std::str::Utf8Chunk` and related types/functions.
- Stabilize `std::num::NonZero<T>`.

.github/workflows/building.yml

@@ -72,7 +72,7 @@ jobs:
       - name: Setup Rust toolchain
         uses: moonrepo/setup-rust@v1
         with:
-          channel: "1.78"
+          channel: "1.79"
           bins: cargo-hack
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Cargo.toml

@@ -20,7 +20,7 @@ license = "Apache-2.0"
 repository = "https://github.com/NJUPT-SAST/rsjudge"
 
 # MSRV is set to N - 2, where N is the current stable version.
-rust-version = "1.78"
+rust-version = "1.79"
 
 [workspace.dependencies]
 log = "0.4.22"