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

Author: renovate[bot]

.github/workflows/release.yml

@@ -123,7 +123,7 @@ jobs:
 
       - name: Upload coverage to Codecov
         if: ${{ !cancelled() && matrix.python-version == '3.13' }}
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           files: ./coverage.xml
           fail_ci_if_error: false