Fix CI

[ohkinozomu]

Fix:

--- FAIL: TestLeaks (0.55s)
    main_test.go:34: found unexpected goroutines:
        [Goroutine 34 in state select, with github.com/golang/glog.(*fileSink).flushDaemon on top of the stack:
        github.com/golang/glog.(*fileSink).flushDaemon(0x158d2b8)
        	/home/runner/go/pkg/mod/github.com/golang/glog@v1.2.1/glog_file.go:351 +0xb9
        created by github.com/golang/glog.init.1 in goroutine 1
        	/home/runner/go/pkg/mod/github.com/golang/glog@v1.2.1/glog_file.go:166 +0x135
        ]
FAIL
FAIL	github.com/wind-c/comqtt/v2/cmd/single	0.558s

Maybe either VerifyTestMain or VerifyNone would be enough.