client requirements should include starlette

[pbeaucage]

#694 and #650 added starlette status constants to the client, but starlette never made it into the client requirements causing an import error if you only install tiled[client].

I believe it should be in both [client] and [minimal-client].

A broader question as this has happened before: could we add a CI test that installs the package with just [minimal-client] or [client] and verifies (to first order) that the package imports, and ideally that a basic client function test passes, maybe against the public test server? This would likely have to be its own GHA/non-pytest script since afaik there is no environment control at the pytest level.

[danielballan]

Good call @pbeaucage! 👍 for a test with client and minimal-client deps only.