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

Author: renovate[bot]

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
         node-version: [16.x, 18.x]
 
     steps:
-    - uses: actions/checkout@v4.3.1
+    - uses: actions/checkout@v6.0.3
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v4.4.0
       with: