Remove expired ports:

2021-01-24 www/sogo4: Unmaintained, please migrate to a newer version of sogo
2021-01-24 www/sogo4-activesync: Unmaintained, please migrate to a newer version of sogo
2021-01-27 security/py-rekall_lib: Unmaintained upstream
2021-01-27 devel/py-rekall-efilter: Unmaintained upstream
2021-01-27 security/py-rekall: Unmaintained upstream, use security/py-volatility3 instead
2021-01-27 security/py-rekall-core: Unmaintained upstream
2021-01-27 www/kurly: Upstream is gone
2021-01-27 security/regripper: Upstream repo disappeared