Gradio & Studio update

[ollmer]

• update gradio, bump to the fresh version without vulnerabilities
• fix agent update from config, instantiate correct nodes, just like subagents
• make studio work with state containing dicts instead of agent and tape objects

[ollmer]

This also closes #81

[jpt-sn]

Do we really need to model_dump and model_validate every time?

From the Gradio documentation it says:

If it holds an object or primitive, a change is triggered if the hash of the value changes. So if you define a custom class and create a gr.State variable that is an instance of that class, make sure that the the class includes a sensible __hash__ implementation.

Have we tried implementing the __hash__ for tape and agent object?

[ollmer]

Yes, I've tried to implement __hash__() for the agent class, which returned agent.model_dump_json(). It didn't help. Also, in case of the absence of a hash method, the state raises an error when created, and we haven't observed such an issue.