test against minimum/dev versions of Pallets libraries #4341
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During the rollout of the 2.0 major version, these were removed because they were always out of sync. Add them back in.
This revealed an incompatibility once Werkzeug 2.1 is released, since it removed
as_tuplebut Flask's test client still passes it. Given that users have already been seeing a deprecation warning from Werkzeug, I'm adding the deprecation here as well, to be removed in Flask 2.1.as_tuplewould return(environ, response), now aTestResponseinstance is always returned.response.request.environhas the same information.