Remove expired ports:
2020-10-25 devel/py-repoze.what: does not build with python3
2020-09-15 net/reposado: Uses deprecated version of python
2020-12-31 devel/py-setuptools_darcs: Uses Python 2.7 which is EOLed upstream
2020-10-25 devel/py-darcsver: does not build with python3
2020-10-25 devel/py-gdata: Unmaintained upstream, superseded by www/py-google-api-python-client
See https://people.freebsd.org/~rene/stuff/old-ports.txt for the "unremovable" ports.