[TEST] update github action

.github/workflows/test.yml

@@ -8,18 +8,13 @@ on:
 
 jobs:
   test:
-    name: Node
     runs-on: ubuntu-latest
     timeout-minutes: 30
-    strategy:
-      matrix:
-        node: [18, 20]
     steps:
       - uses: actions/checkout@v4
-      - name: Setup Node.js v${{ matrix.node }}
         uses: actions/setup-node@v4
         with:
-          node-version: ${{ matrix.node }}
+          node-version: 20
           cache: 'npm'
       - run: npm ci
       - run: npm test