ADK v1.19 requires outputSchema (added in MCP 1.10) but still allows MCP >=1.8 in dependencies

[halfpasttense]

ADK v1.19 relies on mcp.types.Tool.outputSchema but this only got added in mcp v1.10
https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0

However ADK is still set up to accept mcp versions as low as 1.8
pyproject.toml
"mcp>=1.8.0, <2.0.0", # For MCP Toolset