Add setuptools run-time requirement to opencv

conda/opencv/meta.yaml

@@ -175,6 +175,7 @@ outputs:
       run:
         - {{ pin_subpackage('libopencv', exact=True) }}
         - {{ pin_subpackage('py-opencv', exact=True) }}
+        - {{ pin_compatible('setuptools') }}
     test:
       script: run_test_opencv.py