Update qiskit requirement from ~=1.2.0 to ~=1.2.1 (#2503)

Updates the requirements on [qiskit](https://github.com/Qiskit/qiskit) to permit the latest version.
- [Release notes](https://github.com/Qiskit/qiskit/releases)
- [Changelog](https://github.com/Qiskit/qiskit/blob/main/docs/release_notes.rst)
- [Commits](Qiskit/qiskit@1.2.0...1.2.1)

---
updated-dependencies:
- dependency-name: qiskit
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/requirements-qiskit.txt

@@ -1,4 +1,4 @@
-qiskit~=1.2.0
+qiskit~=1.2.1
 qiskit-aer~=0.15.0
 qiskit-ibm-runtime~=0.20.0
 ply==3.11