Change RUN_DEPENDS from py-prettytable to py-prettytable0

• Bump PORTREVISION for dependency change

> py37-ldappool-2.4.1 depends on package: py37-prettytable>=0.7.2<0.8 - not found

• Error code 1

Stop.
make: stopped in /usr/ports/net/py-ldappool

Approved by: portmgr (blanket)