remove `fire` from kannon's dependency

[yokomotod]

now kannon specifies fire as its dependency

https://github.com/m3dev/kannon/blob/0.1.2/pyproject.toml#L21

but it seems not required by kannon itself but by user's code(run_master.py / run_child.py) actually, and not all users use fire.

So I think fire should install by users only if they want.