chore(deps): update codecov/codecov-action action to v6 (#477)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/pytest.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Run tests with coverage
         run: uv run pytest -n auto --cov=autowsgr --cov-report=xml --cov-report=term-missing --junitxml=junit.xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: OpenWSGR/AutoWSGR