Update qiskit-ibm-runtime requirement in /scripts/nb-tester

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@0.40.1...0.42.0)

---
updated-dependencies:
- dependency-name: qiskit-ibm-runtime
  dependency-version: 0.42.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

scripts/nb-tester/requirements.txt

@@ -2,7 +2,7 @@
 # stable build.
 
 qiskit[all]~=2.1.2
-qiskit-ibm-runtime~=0.40.1
+qiskit-ibm-runtime~=0.42.0
 qiskit-ibm-transpiler[ai-local-mode]~=0.14.0
 qiskit-aer~=0.17
 qiskit-serverless~=0.25.4