ci(node): test against node 20

.github/workflows/node-tests.yml

@@ -22,13 +22,14 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
+        node: ["18", "20"]
     steps:
       - uses: actions/checkout@v4
         with:
           show-progress: false
       - uses: actions/setup-node@v4
         with:
-          node-version: "18"
+          node-version: ${{ matrix.node }}
       - name: System info
         run: |
           rustc -vV