Removing `qiskit-terra` dependency in favor of `qiskit`

[1ucian0]

qlearnkit depends on qiskit-terra (>=0.20.0) https://www.wheelodex.org/projects/qlearnkit/ which is reaching EoL:

[!IMPORTANT] The package qiskit-terra is not going to be updated after August 15th, 2024. Since Qiskit 0.44 (released on July 27th, 2023), the qiskit meta-package only contains qiskit-terra. In Qiskit 1.0 and beyond, the meta-package architecture is removed. If you are installing or depending on qiskit-terra, consider changing that to qiskit: Either qiskit>=0.x,<1 (if you did not transition to Qiskit 1.0 yet) or qiskit>=0.x,<2 (to also include Qiskit 1.*). Read more.