Update requirements list to prepare for qiskit 1.0 (#5)

Starting in the Qiskit 1.0.0 release there will only be a Qiskit
package. Unfortunately pip is not able to deal with the overlap between
the qiskit and qiskit-terra packages, see:

https://docs.quantum.ibm.com/api/migration-guides/qiskit-1.0#for-developers

for details on this. The qiskit-qubit-reuse plugin is compatible with
the API changes in Qiskit 1.0.0 (I tested this with qiskit 1.0.0rc1),
but we need to update the requirements so that when users on Qiskit
1.0.0 install qiskit-qubit-reuse it doesn't break the python
environment. This commit makes the appropriate change to the
requirements list and changes the current qiskit-terra>=0.24.0 to
qiskit>=0.43.0 (which is the metapackage release on 0.*) corresponding
to qiskit-terra 0.24.0.

requirements.txt

@@ -1,2 +1,2 @@
-qiskit-terra>=0.24.0
+qiskit>=0.43.0
 rustworkx>=0.12.0