⬆ Bump actions/upload-artifact from 5 to 6 (#14525)

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

.github/workflows/test.yml

@@ -84,7 +84,7 @@ jobs:
       # Do not store coverage for all possible combinations to avoid file size max errors in Smokeshow
       - name: Store coverage files
         if: matrix.coverage == 'coverage'
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/coverage/.coverage.*') }}
           path: coverage
@@ -121,7 +121,7 @@ jobs:
       - run: uv run coverage combine coverage
       - run: uv run coverage html --title "Coverage for ${{ github.sha }}"
       - name: Store coverage HTML
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-html
           path: htmlcov