swift-docc-render needs Node 22 now

Author: gwynne

.github/workflows/build-and-deploy-docs-workflow.yml

@@ -52,10 +52,10 @@ jobs:
         with:
           repository: vapor/swift-docc-render
           path: swift-docc-render
-      - name: Setup node 20
+      - name: Setup node 22
         uses: actions/setup-node@v6
         with:
-          node-version: 20
+          node-version: 22
       - name: Build swift-docc-render
         working-directory: swift-docc-render
         run: npm ci && npm run build