Upgrades GitHub action version

Author: kaczmarczyck

.github/workflows/reproducible.yml

@@ -30,7 +30,7 @@ jobs:
         run: ./maintainers/reproduce_hashes.sh
 
       - name: Upload reproduced binaries
-        uses: actions/upload-artifact@v1
+        uses: actions/upload-artifact@v4
         with:
           name: reproduced-${{ matrix.os }}
           path: reproducible/reproduced.tar