Bump actions/upload-artifact from 6 to 7 (#208)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  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>
Co-authored-by: Fabian Braun <fsbraun@gmx.de>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -40,7 +40,7 @@ jobs:
       run: tox run -f py$(echo ${{ matrix.python-version }} | tr -d .)
 
     - name: Upload coverage data
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       with:
         name: coverage-data-${{ matrix.python-version }}
         include-hidden-files: true
@@ -74,7 +74,7 @@ jobs:
 
       - name: Upload HTML report
         if: ${{ failure() }}
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: html-report
           path: htmlcov