Improve test skipping for unsupported versions

[verdie-g]

See comment #117 (comment)

[verdie-g]

@roji how would you grab a reference to the client 🤔

[roji]

I think this would create a new client, using the same connection credentials as regular tests (this may require a bit of refactoring around). Of course, you only need to actually connect and grab the version on the first time then, then you can cache it.