Update python-prompt-toolkit to 3.0.8

Summary:
Full changelog here

Signed-off-by: Algent Albrahimi <algent@protonmail.com>

Test Plan: Run a few python scripts using spyder3.

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D9974