chore(deps): update codecov/codecov-action action to v6 (#401)

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

Author: renovate[bot]

.github/workflows/test.yml

@@ -43,6 +43,6 @@ jobs:
       run: coverage run --source=. ./manage.py test
     - name: Coverage
       run: coverage xml
-    - uses: codecov/codecov-action@75cd11691c0faa626561e295848008c8a7dddffe # v5
+    - uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6
       with:
         name: Python ${{ matrix.python-version }}, ${{ matrix.os }}