Used Node.js 20 for GitHub actions.

.github/workflows/schedule_tests.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '14'
+          node-version: '20'
           cache: 'npm'
           cache-dependency-path: '**/package.json'
       - run: npm install

.github/workflows/tests.yml

@@ -49,7 +49,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '16'
+          node-version: '20'
           cache: 'npm'
           cache-dependency-path: '**/package.json'
       - run: npm install