Add minimum typer version

[Iain-S]

Although typer is still in 0.x.y, it would be of benefit to have a minimum version specified in setup.cfg.
This line, for example, imports MarkupMode, which was not in typer.core until 0.6.0.

safety/safety/cli_util.py

Line 8 in adc0e6a

from typer.core import TyperGroup, TyperCommand, MarkupMode

Could we change setup.cfg to be

typer>=0.6.0

I'm happy to verify the exact minimum version though I guess that's subject to constant change.

[github-actions]

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