ci: update to actions/checkout@v5

Author: nikku

.github/workflows/CI.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v5
     - name: Use Node.js ${{matrix.node-version}}
       uses: actions/setup-node@v1
       with: