Fix failing tests by pinning matplotlib to <3.6.0 and Qiskit Aer to <0.11.0 #911
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Summary
Recent changes to the latest version of Matplotlib and Qiskit Aer have broken automated tests and CI. This is a quick fix to get CI working again. For part of the discussion, see #909 and #910.
Details and comments
Matplotlib 3.6.0 deprecates a function, which causes some tests to fail. Qiskit Aer 0.11.0 moves to a separate module/namespace, which breaks lint tests. This PR pins these library versions to get CI working again. Once changes have been merged to fix these issues (like #910), the version limitations introduced here can be removed.
Pinging relevant people
@wshanks