CI: bump version of checkout action

Author: zeld

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
           target: aarch64-apple-darwin
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - name: Build
       run: cargo build --verbose --target=${{ matrix.target }}
     - name: Run tests

.github/workflows/release.yml

@@ -59,7 +59,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v6
       with:
         fetch-depth: 1