Update ci.yml

Upload artifact v2 doesn't work anymore.

Author: wb2osz

.github/workflows/ci.yml

@@ -149,7 +149,7 @@ jobs:
             make package
           fi
       - name: archive binary
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: direwolf_${{ matrix.config.os }}_${{ matrix.config.arch }}_${{ github.sha }}
           path: |