fix version of upload-artifact (#89)

Author: twd2

.github/workflows/main.yml

@@ -58,7 +58,7 @@ jobs:
             vijos/jd4 /bin/bash -c "source /venv/bin/activate && python3 -m unittest -v jd4.integration_test"
 
       - name: Upload vijos/jd4 as artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: jd4-img
           path: /tmp/jd4.tar
@@ -72,7 +72,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: Download artifact
-        uses: actions/download-artifact@v4.1.7
+        uses: actions/download-artifact@v4
         with:
           name: jd4-img
           path: /tmp