Upgrade Poetry to 1.1.11

[tayfun]

Rasa Open Source version

3

Rasa SDK version

No response

Rasa X version

No response

Python version

3.8

What operating system are you using?

OSX, Windows

What happened?

Older poetry seems to fail to install some dependencies sometimes (for some OS/Python versions). @ancalita also run into this issue on Mac OS locally.

See example CI failure in https://github.com/RasaHQ/rasa/runs/4867661448?check_suite_focus=true

This blocks https://github.com/RasaHQ/rasa/pull/10590

Definition of done:

• [x] Update .github/poetry_version.txt to have 1.1.11

Command / Request

No response

Relevant log output

No response

[HotThoughts]

FYI, also opened a PR in the rasa-x repo ☝️