Update artifacts action

Author: titusz

.github/workflows/tests.yml

@@ -59,6 +59,13 @@ jobs:
           python -c "import iscc_core; print(iscc_core.turbo())"
 
       - name: Collect Wheel
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
+          name: wheel-${{ matrix.os }}-${{ matrix.python-version }}
           path: dist/*.whl
+  merge:
+    runs-on: ubuntu-latest
+    needs: tests
+    steps:
+      - name: Merge Artifacts
+        uses: actions/upload-artifact/merge@v4