fix: update MCP SDK to v1.20.0 for 2025-06-18 protocol support#8684

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fix/update-mcp-sdk-2025-06-18-protocol

Commits on Oct 16, 2025

fix: update @modelcontextprotocol/sdk to 1.20.0 for 2025-06-18 protocol support
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fix: add type casting for CallToolResultSchema compatibility with SDK v1.20.0
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