Bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tests.yaml

@@ -82,7 +82,7 @@ jobs:
  - name: 🚀 Run pytest
  run: poetry run pytest --cov cybro tests
  - name: ⬆️ Upload coverage artifact
- uses: actions/upload-artifact@v3
+ uses: actions/upload-artifact@v4
  with:
  name: coverage-${{ matrix.python }}
  path: .coverage