fix: Update Node.js version in GitHub Actions workflow to 20

Author: jwaspin

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: '14.x'
+          node-version: '20'
 
       - name: Install Node.js dependencies
         run: npm install --force