Curator fails with ModuleNotFoundError: No module named `ruamel`

Issue

• Curator pod in Error state
• Curator fails with the following error:

Traceback (most recent call last):
  File "/opt/app-root/src/lib/oalconverter/convert.py", line 18, in <module>
    from ruamel import yaml
ModuleNotFoundError: No module named 'ruamel'
Usage: curator [OPTIONS] ACTION_FILE

Error: Invalid value for "action_file": Path "/opt/app-root/src/actions.yaml" does not exist.