chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
     - name: Checkout 
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Use Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
     - name: Use Node.js ${{ matrix.node-version }}