Don't explicitly require werkzeug<2.1.0 for tests
    
    Upstream pins werkzeug<2.1.0 to avoid a problem in httpbin that Fedora has patch for:
    
    https://github.com/httpie/httpie/pull/1345
    
    We revert it to allow building with newer werkzeug 2.2 already present in Fedora 37+.