Update upload-artifact

Author: richardkoehler

.github/workflows/ci.yml

@@ -155,7 +155,7 @@ jobs:
           uv run briefcase package windows -p zip
 
       - name: Upload Briefcase ZIP artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: briefcase-windows-zip-${{ github.sha }}
           path: dist/