bpo-43916: Use test.support.check_disallow_instantiation() in test_tcl (GH-26412) (GH-26888)

(cherry picked from commit e90e0422182f4ca7faefd19c629f84aebb34e2ee)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>
1 file changed