devel/py-rope: Update to 1.7.0

First update since Oct 2020 with several major releases and bug fixes.
Needed for an update of textproc/py-python-lsp-server.

• Change from distutils to pep517
• Add pytest (1 failed, 2013 passed, 21 skipped, 5 xfailed, 1809 warnings)
• License changed from GPLv2 to LGPL3+
• Project moved from SourceForge to GitHub

PR: 268912
Approved by: maintainer timeout