ci: test on node 18 and 20 (#835)

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [14, 16]
+        node: [18, 20]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
@@ -30,6 +30,6 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 20
       - run: npm install
       - run: npm test

.github/workflows/release-please.yaml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v3
       with:
-        node-version: 16
+        node-version: 20
     - name: install
       run: npm ci
     - name: build