GitHub Actions: use node 20

react-router says it needs this

Author: bigdogwillfeed

.github/workflows/build-and-deploy_devresults-xdev.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up Node.js version
         uses: actions/setup-node@v4
         with:
-          node-version: "18.x"
+          node-version: "20.x"
 
       - uses: pnpm/action-setup@v3
         with: