Pytket-qiskit

- Update qiskit minimum version requirement to 1.4.2.
- Uptdate lightsabre pass to be a `CustomPassMap` object.
- Update pytket version requirement to 2.1.0.

- Improve {py:func}`qiskit_to_tk` to handle `IfElseOp` (generated by `QuantumCircuit.if_test`)
with register conditions. Only conditions on an entire register are supported.
- Fix conversion of `CnZ` gates when the number of control qubits is one.

- Update pytket version requirement to 2.0.1.

- Support conversion of qiskit circuits containing `IfElseOp` in the {py:func}`qiskit_to_tk` converter. Note: Only conditions on a single bit are supported currently. Handling of more general conditions will be added in future.
- Reject circuits containing nested conditionals when converting to qiskit.
- Update pytket version requirement to 1.39.0.
- Add support for fractional gates on backends that support them.

- AerBackend now rejects circuits with too many qubits
- Update pytket version requirement to 1.37.0.
- Update qiskit version requirement to 1.3.1.
- Fix conversion of circuits containing multiple operations conditioned on the
same scratch bit.

- Restrict qiskit version to ~= 1.2.4, to avoid breaking changes in 1.3.0