Bump actions/upload-artifact from 5 to 6

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

.github/workflows/build.yml

@@ -98,7 +98,7 @@ jobs:
           mv ./wheelhouse/.ccache $HOST_CCACHE_DIR
           ls -la $HOST_CCACHE_DIR
           ccache -s
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: artifact-${{ matrix.os }}-${{ matrix.cibw_arch }}-${{ strategy.job-index }}
           path: ./wheelhouse/*.whl
@@ -113,7 +113,7 @@ jobs:
     - name: Build SDist
       run: pipx run build --sdist
 
-    - uses: actions/upload-artifact@v5
+    - uses: actions/upload-artifact@v6
       with:
         name: artifact-sdist
         path: dist/*.tar.gz