[CI] Fix incompatible Python version with symengine #131
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Previously env.yml automatically chose the latest Qiskit version. On Oct 4, 2023, Qiskit-terra released v0.25.2.1 (Qiskit v0.44.0), which required
symengine < 0.10
. While symengine v0.10 fixed a bug in #110, previous CI used symengine v0.9.2, and the linesymengine < 0.10
existed in Qiskit-terra since March, so this is probably not the exact reason why CI failed.After several tries, fixing Python to any minor version of 3.11 (i.e., < 3.12) seems to solve this issue. It seems that symengine does not support Python 3.12 yet (symengine/symengine-wheels#11, Qiskit/qiskit#10887).