chore(deps): update dependency node to v22.21.0 (withastro#12598)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/actions/install/action.yml

@@ -10,7 +10,7 @@ runs:
     - name: Setup Node
       uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
       with:
-        node-version: 22.20.0
+        node-version: 22.21.0
         cache: pnpm
 
     - name: Install dependencies