Update dependencies based on the dependabot check + fix prompt-toolkit dependency

[alwx]

Proposed changes:

• Update dependencies based on the dependabot check.
• Correctly specify the minimum supported Python version because the fixed version of prompt-toolkit requires Python 3.6.1.

Status (please check what you already did):

• updated the documentation
• updated the changelog (please check changelog for instructions)

[wochinge]

Thanks for putting all these in one PR 🚀 Due to the change in the minimum required Python version, just a "comment" for now

[erohmensing]

@alwx my changes fix shell for regular input, but the button questions are still throwing bc those weren't fixed -- there are other places to check, so i'm going to remove my changes here, then open a new PR with them to make stuff clearer