Upgrade skipper click version to latest major

[omertuc]

Since skipper is useful to be installed as a system-level package and not just in a virtualenv, the older click version conflicts with other utilities that use newer version of click (such as Black)

This upgrade should fix that conflict. The breaking changes between 6.0 -> 7.0 were changing underscores to dashes by default. Skipper doesn't have any underscores in its subcommands

The breaking changes between 7.0 and 8.0 seem to be just dropping support for Python 3.5 and Python 2.7

So I think this upgrade should be rather seamless

[eranco74]

Dropping support for python 2.7 isn't seamless. Currently, Skipper support Python 2.7, we even use test metrics to validate it. On the other hand, it's 2021, perhaps it's about time. @tsorya @romfreiman @ronniel1 thoughts?

[roeigo-stratoscale]

@eranco74 Just a reminder another small company uses this project and still need support for python 2.7 :)

[eranco74]

@roeigo-stratoscale that small (and amazing) company owns the master branch.

[sonarqubecloud[bot]]

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