fix: fix integ test for mcp elicitation_server

[JackYPCOnline]

Description

fix integ test.
request example:
https://modelcontextprotocol.io/specification/2025-06-18/client/elicitation

Related Issues

Error message:

FAILED tests_integ/mcp/test_mcp_elicitation.py::test_mcp_elicitation - json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Documentation PR

Type of Change

Bug fix
New feature
Breaking change
Documentation update
Other (please describe):

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!