chore(deps): update codecov/codecov-action action to v6 (#193)

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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -38,7 +38,7 @@ jobs:
       - name: Test with pytest and generate coverage file
         run: tox -e py
       - name: Upload coverage report to codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         if: success()
         with:
           file: coverage.xml