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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
 
     - name: Upload coverage reports to Codecov
       if: matrix.python-version == '3.14'
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       env:
         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       with: