Patch release v1.4.3 - Make cv2 install optional
As per discussion: vllm-project/vllm#8650 make cv2 optional.
What's Changed
- [Error Message] Improve error message by @patrickvonplaten in #54
- Make cv2 optional by @patrickvonplaten in #56
Full Changelog: v1.4.2...v1.4.3