fix(ci): bump Pages deploy to Node 22 (Astro requires >=22.12)

Author: felixgeelhaar

.github/workflows/deploy.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v6
         with:
-          node-version: "20"
+          node-version: "22"
           cache: 'npm'
           cache-dependency-path: docs/package-lock.json