🐛 Fix flake8 F401: suppress unused pytest import in placeholder test

Author: johngeorgea157-stack

benchmarks/tests/test_circuits.py

@@ -7,7 +7,7 @@
     - Circuits are valid Qiskit QuantumCircuit objects
 """
 
-import pytest
+import pytest  # noqa: F401
 
 # TODO: Uncomment and implement after circuits.py is built
 # from benchmarks.circuits import build_test_circuit