build(deps): bump prompt-toolkit from 2.0.5 to 2.0.8 in /backend
build(deps): bump prompt-toolkit from 2.0.5 to 2.0.8 in /backend

Bumps [prompt-toolkit](https://github.com/jonathanslenders/python-prompt-toolkit) from 2.0.5 to 2.0.8.
- [Release notes](https://github.com/jonathanslenders/python-prompt-toolkit/releases)
- [Changelog](https://github.com/prompt-toolkit/python-prompt-toolkit/blob/master/CHANGELOG)
- [Commits](https://github.com/jonathanslenders/python-prompt-toolkit/compare/2.0.5...2.0.8)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
kkmsc17/smes,kkmsc17/smes,kkmsc17/smes,kkmsc17/smes,kkmsc17/smes,kkmsc17/smes