net/py-errbot: Revert e327fd83e67532c68a0ac11e4c4955a540b3fead

It should be committed along with the py-markdown 3.3+ update.

from pkg-fallout [1]:

> py38-errbot-6.1.7 depends on package: py38-markdown>3.3 - not found

• Error code 1

PR: 255278
Reference: http://beefy16.nyi.freebsd.org/data/130amd64-default/0ae18b07e470/logs/py38-errbot-6.1.7.log [1]