Update qiskit-serverless requirement from ~=0.25.4 to ~=0.26.1 in /scripts/nb-tester#3941

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dependabot/pip/scripts/nb-tester/qiskit-serverless-approx-eq-0.26.1Qiskit/documentation:dependabot/pip/scripts/nb-tester/qiskit-serverless-approx-eq-0.26.1Copy head branch name to clipboard