fix: update requirements with version pins and add opencv-python

[omrode1]

Description

This PR updates the requirements files with version pins and adds missing dependencies to improve installation reliability and consistency.

Changes

1. Added version pins to all dependencies in requirements/runtime.txt
2. Added opencv-python to runtime requirements as it's commonly used
3. Added version pins to all dependencies in requirements/optional.txt

Benefits

• Prevents dependency conflicts
• Makes the installation process more reliable
• Ensures consistent behavior across different environments
• Makes it easier for new contributors to set up their development environment

Testing

The changes have been tested by:

• Verifying all version pins are valid and available on PyPI
• Ensuring the added dependencies are compatible with the existing codebase

[CLAassistant]

All committers have signed the CLA.

[lauriebax]

Hey 👋 We've updated 7 core repos (MMDetection, MMSegmentation, and others) to work with the latest PyTorch and made them production-ready for our AI platform.

We're committed to maintaining these repos going forward and encourage you to contribute features through pull requests.

Check them out if you need PyTorch (or other) compatibility: https://github.com/VBTI-development —feedback welcome!

This includes updating versions of most dependencies.