Bump actions/upload-artifact from 5 to 6 (#421)

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
...

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

Author: dependabot[bot]

.github/workflows/wheels.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Check metadata
       run: pipx run twine check dist/*
 
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       with:
         name: dist-sdist
         path: dist/*.tar.gz
@@ -49,7 +49,7 @@ jobs:
       shell: bash
 
     - name: Upload wheels
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         path: wheelhouse/*.whl
         name: dist-${{ matrix.os }}