Update CI workflow to use actions v3 for artifact upload and download

- Changed the artifact upload and download actions from v4 to v3 for compatibility.
- Ensured the CI workflow remains efficient while maintaining functionality.

.gitea/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
           VITE_POCKETBASE_URL: ${{ vars.VITE_POCKETBASE_URL || 'https://pocketbase.ccllc.pro' }}
 
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: app
           path: |
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download build artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: app