Specify minimal kgx dependency

[caufieldjh]

The template defines a few dependencies in a very open way:

click = "*"
kghub-downloader = "*"
kgx = "*"
koza = "*"
biolink-model = "*"
requests-cache = "*"

It's reasonable to assume that the newest compatible version of each will be installed, but this may not be the case - I ended up with kgx of 1.1.0, for example, on a new repo.
Perhaps a minimum of v2.2.3 for kgx would be appropriate.