Updated opencv version as the currently listed version is throwing error

open cv version updated to "opencv-python-headless==4.5.2.52"

PiperOrigin-RevId: 445764980

official/requirements.txt

@@ -19,7 +19,7 @@ matplotlib
 # Loader becomes a required positional argument in 6.0 in yaml.load
 pyyaml>=5.1,<6.0
 # CV related dependencies
-opencv-python-headless
+opencv-python-headless==4.5.2.52
 Pillow
 pycocotools
 # NLP related dependencies