ci: downgrade upload-artifact and download-artifact from v4 to v3 in all three deploy workflows

.gitea/workflows/deploy-api.yml

@@ -71,7 +71,7 @@ jobs:
         run: tar -czf deepdrft-api.tar.gz -C DeepDrftAPI/publish .
 
       - name: Upload artifacts (archive + bundle)
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: deepdrft-api
           path: |
@@ -90,7 +90,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Download artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: deepdrft-api
           path: staging/