[chore] bumped download artifact action to v4

Author: Kharonus

.github/workflows/release.yml

@@ -50,7 +50,7 @@ jobs:
             - uses: actions/checkout@v2
 
             - name: Download artifact
-              uses: actions/download-artifact@v2
+              uses: actions/download-artifact@v4
               with:
                   name: openproject-cli