bump playwright version to 1.50

[SmartManoj]

For Python 3.13 https://github.com/python-greenlet/greenlet/issues/392#issuecomment-2446961814

Description by Korbit AI

What change is being made?

Update the playwright package version from 1.39 to 1.50 in the requirements.txt file.

Why are these changes being made?

The update ensures compatibility with the latest features, bug fixes, and performance improvements provided in the newer version of playwright. This change also maintains the project's dependencies up to date, which is crucial for leveraging enhancements and security patches introduced since the previous version.

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