CI(dependabot): Bump actions/upload-artifact from 2 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...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]>

.github/workflows/build.yml

@@ -83,7 +83,7 @@ jobs:
         run: pip install cibuildwheel
       - name: Build wheels
         run: cibuildwheel --output-dir wheelhouse
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: wheels-${{ matrix.os }}-${{ matrix.python }}-${{ matrix.arch }}
           path: ./wheelhouse/*.whl
@@ -103,7 +103,7 @@ jobs:
       - name: Build a source tarball
         run:
             python setup.py sdist
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         with:
           name: tarball
           path: dist