Update GitHub Actions checkout action version

Author: 404Setup

.github/workflows/ci.yml

@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Rust
         uses: dtolnay/rust-toolchain@nightly