WARNING: rasa 2.8.12 does not provide the extra 'convert'

[trammell]

When building commit 5241112f with pip install -r requirements.txt, I get this error:

Collecting rasa[convert]==2.8.12
 Downloading rasa-2.8.12-py3-none-any.whl (768 kB)
    ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 768.2/768.2 kB 3.7 MB/s eta 0:00:00
Collecting pytablewriter
  Using cached pytablewriter-0.64.2-py3-none-any.whl (106 kB)
WARNING: rasa 2.8.12 does not provide the extra 'convert'
...

This looks to be due to this line in requirements.txt:

rasa[convert]==2.8.12

My environment:

% rasa --version
Rasa Version      :         2.8.12
Minimum Compatible Version: 2.8.9
Rasa SDK Version  :         2.8.6
Rasa X Version    :         None
Python Version    :         3.8.16
Operating System  :         macOS-10.16-x86_64-i386-64bit
Python Path       :         /usr/local/Caskroom/miniconda/base/envs/py38-rasaOS28/bin/python