Fix for *.yaml emojis on load

[glenn-jocher]

Fix for Colab hub error:

import yaml

with open('yolov5s.yaml', errors='ignore') as f:
     d = yaml.safe_load(f)  # model dict

print(d)

---------------------------------------------------------------------------
ReaderError                               Traceback (most recent call last)
<ipython-input-8-1150b5143073> in <module>()
      2 
      3 with open('yolov5s.yaml', errors='ignore') as f:
----> 4      d = yaml.safe_load(f)  # model dict
      5 
      6 print(d)

6 frames
/usr/local/lib/python3.7/dist-packages/yaml/reader.py in check_printable(self, data)
    142             position = self.index+(len(self.buffer)-self.pointer)+match.start()
    143             raise ReaderError(self.name, position, ord(character),
--> 144                     'unicode', "special characters are not allowed")
    145 
    146     def update(self, length):

ReaderError: unacceptable character #x1f680: special characters are not allowed
  in "yolov5s.yaml", position 9

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved file reading compatibility in YOLO model initialization.

📊 Key Changes

• Changed file opening method by specifying encoding='ascii' during YOLO model configuration file reading.

🎯 Purpose & Impact

• 🛠️ Purpose: Enhances compatibility with different system environments, ensuring files are read correctly regardless of the default system encoding.
• 💻 Impact: Users may experience fewer errors when initializing YOLO models, particularly on systems with non-ASCII default encodings. This small but crucial change can help in avoiding character encoding-related bugs.