devel/py-pyperclip: Update to 1.9.0

• Add LICENSE_FILE
• Use USES=dos2unix
• Convert to USE_PYTHON=pep517
• Sort USE_PYTHON
• Take maintainership

Changes: https://github.com/asweigart/pyperclip/commits/master
PR: 295154
Approved by: maintainer (timeout, 16 days)