ci: fix faulty workflow

.github/workflows/tests.yml

@@ -14,12 +14,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
-
-      - name: Set up Rust
-        uses: actions/setup-rust@v1
-        with:
-          rust-version: stable
+        uses: actions/checkout@v5
 
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+        
       - name: Run tests
         run: cargo test --all --verbose