ci: bump GitHub Actions to latest versions (#203)

Author: okuryu

.github/workflows/test.yml

@@ -11,11 +11,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [20.x, 22.x, 24.x]
+        node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v3
+      - name: Checkout
+        uses: actions/checkout@v6
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci