prevent deprecation warning #146

Job	Run time
list-notebooks	5s
notebook (tutorials/bose-hubbard/bose-hubbard.ipynb)	31m 20s
notebook (tutorials/bosonic-kitten-code/bosonic-kitten-code.ipynb)	20m 44s
notebook (tutorials/bosonic-qiskit-textbook/1. introduction.ipynb)	1m 37s
notebook (tutorials/bosonic-qiskit-textbook/2. operators.ipynb)	1m 39s
notebook (tutorials/bosonic-qiskit-textbook/3. coherent_states.ipynb)	1m 55s
notebook (tutorials/bosonic-qiskit-textbook/4. wigner_distribution.ipynb)	1m 56s
notebook (tutorials/bosonic-qiskit-textbook/5. gates.ipynb)	2m 1s
notebook (tutorials/displacement-calibration/displacement-calibration.ipynb)	2m 53s
notebook (tutorials/jaynes-cummings-model/jaynes-cummings-dispersive.ipynb)	2m 50s
notebook (tutorials/medium_article/examples.ipynb)	5m 0s
notebook (tutorials/reduced-density-matrix/reduced-density-matrix.ipynb)	1m 45s
notebook (tutorials/wigner-function/wigner-function.ipynb)	26m 10s
notebook (tutorials/wigner-mle/wigner-mle.ipynb)	2m 19s
	1h 42m 14s

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