ci(pages): node 22 for the astro 7 build

Astro 7 requires a newer node than the pinned 20; the docs deploy
failed on the upgrade while the previous deployment kept serving.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: mstrathman

.github/workflows/pages.yml

@@ -39,7 +39,7 @@ jobs:
         id: pages
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: npm
           cache-dependency-path: website/package-lock.json
       - run: npm ci