chore(node): update node in CI to v18, v20

Author: floryst

.github/workflows/build-test.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-20.04]
-        node: [14, 16, 18]
+        node: [18, 20]
     name: ${{ matrix.os }} and node ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v2

.github/workflows/pr-checks.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 20
       - run: npm ci
       - name: Enforce code style
         run: npm run validate

.github/workflows/publish.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Setup node
         uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 20
       - name: Install dependencies
         run: |
           npm ci