irc/py-sopel: update to 8.0.0 and un-deprecate

Further changes:

• Put COPYING on files/ (No longer included in the distribution file).
• Use sqlalchemy14 instead of sqlalchemy13.
• Use pep517 instead of distutils.
• Add files/patch-pyproject.toml.

ChangeLog: https://github.com/sopel-irc/sopel/releases/tag/v8.0.0

PR: 279656