Pin matplotlib==3.10.9 for extra dev dependencies

noxfile.py

@@ -40,7 +40,10 @@ def tests_minimal(session: Session) -> None:
     """Run the test suite with minimal dependencies."""
     session.install(".")
     install_pytest(session)
-    run_pytest(session, mpl=True)
+    # We cannot run `pytest --mpl` here because the visualization output
+    # depends on the Matplotlib version, and the pinning is only present
+    # in the `dev` extra.
+    run_pytest(session)
 
 
 @nox.session(python=PYTHON_VERSIONS)

pyproject.toml

@@ -58,9 +58,10 @@ dev = [
     "pytest-cov",
     "pytest-mock",
     "pytest-mpl",
-    "qiskit>=1.0",
+    "qiskit>=1.0,<2.4",
     "qiskit_qasm3_import",
     "qiskit-aer",
+    "matplotlib==3.10.9",
 ]
 doc = [
     "furo",