Use active LTS for mutation tests

.github/workflows/stryker-javascript.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-node@v4
       with:
-        node-version: '20.x'
+        node-version: '22.x'
         cache: 'npm'
         cache-dependency-path: javascript/package-lock.json
     - run: npm install