OTOC example tutorial fails to run

[mhucka]

Describe the issue

The tutorial notebook at https://quantumai.google/cirq/experiments/otoc/otoc_example fails to run in Cirq after Cirq 1.3. This started happening after we updated the Cirq version dependency in ReCirq because the class PhasedFSimEngineSimulator was removed by Cirq PR #6442 and does not exist in Cirq 1.4+.

How can the issue be reproduced?

Attempting to run the tutorial in Colab demonstrates the failure. The failing code is

processor_id = ""
use_noisy_simulator = use_noisy_simulator or processor_id == "" 
if use_noisy_simulator:
    print("Using a noisy simulator.")
    sampler = cg.PhasedFSimEngineSimulator.create_with_random_gaussian_sqrt_iswap(
        mean=cg.SQRT_ISWAP_INV_PARAMETERS,
        sigma=cg.PhasedFSimCharacterization(
            theta=0.01, zeta=0.10, chi=0.01, gamma=0.10, phi=0.02
        ),
    )
    device = cg.Bristlecone
else:
    sampler = cg.get_engine_sampler(processor_id, gate_set_name="sqrt_iswap")
    device = cg.get_engine_device(processor_id=processor_id)