Update qiskit-ibm-runtime requirement from ~=0.20.0 to ~=0.31.0

Updates the requirements on [qiskit-ibm-runtime](https://github.com/Qiskit/qiskit-ibm-runtime) to permit the latest version.
- [Release notes](https://github.com/Qiskit/qiskit-ibm-runtime/releases)
- [Commits](Qiskit/qiskit-ibm-runtime@0.20.0...0.31.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

requirements/requirements-qiskit.txt

@@ -1,4 +1,4 @@
 qiskit~=1.2.2
 qiskit-aer~=0.15.1
-qiskit-ibm-runtime~=0.20.0
+qiskit-ibm-runtime~=0.31.0
 ply==3.11