Update build docs workflow to fix ci

Author: Xtr126

.github/workflows/build-docs.yml

@@ -8,12 +8,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout your repository using git
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: Xtr126/XtMapper-docs
 
       - name: Install, build, and upload your site
-        uses: withastro/action@v2
+        uses: withastro/action@v6
         with:
-            node-version: 20
             package-manager: pnpm@latest