Test MCP

ci: Install uv in `update-tox` job #4168

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Run time

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Job	Run time
MCP (3.14, ubuntu-22.04)	45s
MCP (3.14t, ubuntu-22.04)	59s
MCP (3.13, ubuntu-22.04)	1m 16s
MCP (3.10, ubuntu-22.04)	1m 17s
MCP (3.12, ubuntu-22.04)	1m 15s
All MCP tests passed	4s
	5m 36s