🩹 Ignore DeprecationWarning in Qiskit code

[burgholzer]

Description

An update in numpy has triggered a DeprecationWarning in Qiskit code that now trips up in our tests. This PR ignores the respective warning as it does not concern us.

Checklist:

• [x] The pull request only contains commits that are related to it.
• [x] I have added appropriate tests and documentation.
• [x] I have made sure that all CI jobs on GitHub pass.
• [x] The pull request introduces no new warnings and follows the project's style guidelines.

[codecov[bot]]

Codecov Report

Merging #289 (448c07a) into main (e253c80) will decrease coverage by 0.2%. The diff coverage is n/a.

@@           Coverage Diff           @@
##            main    #289     +/-   ##
=======================================
- Coverage   96.1%   96.0%   -0.2%     
=======================================
  Files         34      34             
  Lines       1712    1713      +1     
  Branches     208     208             
=======================================
- Hits        1646    1645      -1     
- Misses        66      68      +2     

Flag	Coverage Δ
cpp	95.6% <ø> (-0.2%)	:arrow_down:
python	97.3% <ø> (ø)

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see 2 files with indirect coverage changes