Drop PL<2 support

[simon-donike]

Pull Request

Description

Dropped support for PL and PT under 2, enhanced ESRGAN.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• locally
• CI tests

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules