build(deps): bump actions/upload-artifact from 5 to 6 (#63)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/pypi-publish.yaml

@@ -21,7 +21,7 @@ jobs:
       - name: Build sdist
         run: |
           python3 setup.py sdist
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: source-dist
           path: ./dist/*.tar.gz
@@ -53,7 +53,7 @@ jobs:
           # emulated ones
           CIBW_ARCHS_LINUX: auto aarch64 ppc64le s390x
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: ${{matrix.os}}-wheels
           path: ./wheelhouse/*.whl