Fix how quotes are parsed in json

[dirkbrnd]

Description

When we have agents that respond with JSON with quotes in the fields, then it breaks parsing. This fixes that.

Fixes #2128

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Type of change

Please check the options that are relevant:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Model update (Addition or modification of models)
• Other (please describe):

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Checklist

• Adherence to standards: Code complies with Agno’s style guidelines and best practices.
• Formatting and validation: You have run ./scripts/format.sh and ./scripts/validate.sh to ensure code is formatted and linted.
• Self-review completed: A thorough review has been performed by the contributor(s).
• Documentation: Docstrings and comments have been added or updated for any complex logic.
• Examples and guides: Relevant cookbook examples have been included or updated (if applicable).
• Tested in a clean environment: Changes have been tested in a clean environment to confirm expected behavior.
• Tests (optional): Tests have been added or updated to cover any new or changed functionality.

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Additional Notes

Include any deployment notes, performance implications, security considerations, or other relevant information (e.g., screenshots or logs if applicable).

[manthanguptaa]

I tried running this example you mentioned in the issue

from typing import List

from agno.agent import Agent, RunResponse  # noqa
from agno.models.anthropic import Claude
from pydantic import BaseModel, Field
from rich.pretty import pprint  # noqa


class MovieScript(BaseModel):
    script: str = Field(
        ..., description="The script of the movie."
    )


movie_agent = Agent(
    model=Claude(id="claude-3-5-sonnet-20240620"),
    description="You help people write movie scripts. Always add some example dialog in your scripts in double quotes.",
    response_model=MovieScript,
    structured_outputs=True,
)

# Get the response in a variable
run: RunResponse = movie_agent.run("New York")
pprint(run.content)

After running it thrice it failed to convert it to json all 3 times.