Unit 1 update gradio mcp client endpoint to work around mcp 1.9.0 breaking change

[neonwatty]

mcp 1.9.0 has a breaking change for gradio mcp endpoints currently under investigation.

The example gradio endpoint in unit 1 https://abidlabs-mcp-tools.hf.space/gradio_api/mcp/sse uses this latest version and returns 404 errors at present when invoked via the example code.

This PR replaces the endpoint with a duplicated space created by the same author https://abidlabs-mcp-tools2.hf.space/gradio_api/mcp/sse that pins mcp to 1.8.1, avoiding the breaking change allowing the example to function as expected.

This is a temporary solution but at least prevents 404 returns from the current endpoint. It likewise addresses #57.

[julien-c]

pinging @abidlabs just in case

[burtenshaw]

Thanks @neonwatty . This is really use because we received some community queries.

I'm actually changing the mcp clients in unit 1 to not use smolagents, and instead jus InferenceClient. Therefore, I've brought your changes into unit 2 instead, where we use this space, mcp, and smolagents.

#75