ci: bump checkout/setup-node to v5 (drop Node 20 deprecation warning)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: abhi-singhs

.github/workflows/test.yml

@@ -14,8 +14,8 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
         with:
           node-version: ${{ matrix.node-version }}
       - name: Syntax check