ci: Upgrade checkout to v4

Signed-off-by: Margen67 <[email protected]>

Author: Margen67

.github/workflows/code_quality.yml

@@ -19,7 +19,7 @@ jobs:
           - x86_64-unknown-linux-gnu
     steps:
       - name: Code checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install Rust toolchain (${{ matrix.rust }})
         uses: actions-rs/toolchain@v1
         with: