Update build_docs.yaml

Author: lufre1

.github/workflows/build_docs.yaml

@@ -44,7 +44,7 @@ jobs:
       run: ls -la doc/html
 
     - name: Upload Documentation Artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: documentation
         path: doc/html
@@ -61,7 +61,7 @@ jobs:
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
       - name: Download Documentation Artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: documentation
       - name: Deploy to GiHub Pages