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

Author: renovate[bot]

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
         node-version: [ 20, 22 ]
     steps:
       - name: Checkout Source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6