Bump node version in CI

Author: timacdonald

.github/workflows/tests.yml

@@ -17,10 +17,10 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Use Node.js 18.x
+      - name: Use Node.js 22.x
         uses: actions/setup-node@v3
         with:
-          node-version: 18.x
+          node-version: 22.x
 
       - name: Install dependencies
         run: npm install