Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/buildwheel.yml

@@ -52,7 +52,7 @@ jobs:
             bin\cibw_repair_wheel_command_windows.bat {dest_dir} {wheel}
           CIBW_TEST_COMMAND: python -c "import flint; print(str(flint.fmpz(2)))"
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: wheelhouse/*.whl
 
@@ -71,7 +71,7 @@ jobs:
       - run: pip install cython setuptools
       - run: python setup.py sdist
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: dist/*.tar.gz