Update codecov/codecov-action action to v6 (#57)

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

Author: renovate[bot]

.github/workflows/test-php.yml

@@ -88,7 +88,7 @@ jobs:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
       - name: Upload coverage report to Codecov
-        uses: codecov/codecov-action@75cd11691c0faa626561e295848008c8a7dddffe # v5
+        uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6
         if: matrix.php-versions == '8.3' && matrix.deps == 'normal' && env.CODECOV_TOKEN != ''
         with:
           files: .logs/cobertura.xml