Race tests flaky on master

[m110]

trafficstars

--- FAIL: TestRouter_context_cancel_does_not_log_error (3.00s)
    router_test.go:1357: 
        	Error Trace:	/home/runner/work/watermill/watermill/message/router_test.go:1357
        	Error:      	Condition never satisfied
        	Test:       	TestRouter_context_cancel_does_not_log_error
        	Messages:   	Router should be closed after all handlers are stopped
FAIL

https://github.com/ThreeDotsLabs/watermill/actions/runs/10736759138/job/29776849651