Update prompt-toolkit to 3.0.9

[pyup-bot]

This PR updates prompt-toolkit from 3.0.7 to 3.0.9.

Changelog

3.0.9

-----------------

New features:
- Handle c-tab for TERM=linux.

Fixes:
- Improve rendering speed of `print_formatted_text`. (Don't render styling
attributes to output between fragments that have identical styling.)
- Gracefully handle `FileHistory` decoding errors.
- Prevent asyncio deprecation warnings.

3.0.8

-----------------

New features:
- Added `validator` parameter to `input_dialog`.

Fixes:
- Cope with stdout not having a working `fileno`.
- Handle situation when /dev/null is piped into stdin, or when stdin is closed
somehow.
- Fix for telnet/ssh server: `isatty` method was not implemented.
- Display correct error when a tuple is passed into `to_formatted_text`.
- Pass along WORD parameter in `Document._is_word_before_cursor_complete`.
Fixes some key bindings.
- Expose `ProgressBarCounter` in shortcuts module.

Links

• PyPI: https://pypi.org/project/prompt-toolkit
• Changelog: https://pyup.io/changelogs/prompt-toolkit/
• Repo: https://github.com/prompt-toolkit/python-prompt-toolkit

[pyup-bot]

Closing this in favor of #1521