chore(deps): update withastro/action action to v5

Author: renovate[bot]

.github/workflows/deploy.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
       - name: Install, build, and upload your site output
-        uses: withastro/action@v4
+        uses: withastro/action@v5
         with:
           package-manager: pnpm