Test MCP

ci: Limit `update-tox` action to master branch #3192

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Run time

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Job	Run time
MCP (3.13, ubuntu-22.04)	3m 50s
MCP (3.14t, ubuntu-22.04)	2m 48s
MCP (3.10, ubuntu-22.04)	3m 13s
MCP (3.12, ubuntu-22.04)	2m 49s
MCP (3.14, ubuntu-22.04)	2m 15s
All MCP tests passed	3s
	14m 58s