Gemini integration does not work with `AnswerBuilder`

[medsriha]

Describe the bug

I encountered the following error when connecting GoogleAIGeminiGenerator with the AnswerBuilder component.

haystack.core.errors.PipelineConnectError: Cannot connect 'llm.replies' with 'answer_builder.replies': their declared input and output types do not match.
'llm':
 - replies: List[Union[str, Dict[str, str]]]
'answer_builder':
 - replies: Union[List[str], List[ChatMessage]] (available)

To Reproduce

    from haystack import Pipeline
    from haystack.components.builders import AnswerBuilder
    from haystack_integrations.components.generators.google_ai import GoogleAIGeminiGenerator
    from haystack.utils import Secret

    gemini = GoogleAIGeminiGenerator(model="gemini-pro", api_key=Secret.from_env_var("GEMINI-API-KEY") )

    pipeline = Pipeline()

    pipeline.add_component(name="llm", instance=gemini)
    pipeline.add_component(name="answer_builder", instance=AnswerBuilder())

    pipeline.connect("llm.replies", "answer_builder.replies")

    res = pipeline.run(data={"llm": {"parts": "Hello"}, "answer_builder": {"query": "hello"}})

Describe your environment (please complete the following information):

• OS: [e.g. iOS] iOS
• Haystack version: v2.3.1
• Integration version: