flaky test explaintest

[hawkingrei]

Bug Report

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1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

[2023/07/31 14:05:45.699 +08:00] [ERROR] [main.go:674] ["open Db failed"] ["take time"=30.066849144s] [error="dial tcp [::1]:35611: connect: connection refused"]

[2023/07/31 14:05:45.700 +08:00] [FATAL] [main.go:694] ["open DB failed"] [error="dial tcp [::1]:35611: connect: connection refused"] [errorVerbose="dial tcp [::1]:35611: connect: connection refused\ngithub.com/pingcap/errors.AddStack\n\t/go/pkg/mod/github.com/pingcap/[email protected]/errors.go:174\ngithub.com/pingcap/errors.Trace\n\t/go/pkg/mod/github.com/pingcap/[email protected]/juju_adaptor.go:15\nmain.openDBWithRetry\n\t/home/jenkins/agent/workspace/pingcap/tidb/ghpr_check/tidb/cmd/explaintest/main.go:675\nmain.main\n\t/home/jenkins/agent/workspace/pingcap/tidb/ghpr_check/tidb/cmd/explaintest/main.go:689\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:250\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1598"] [stack="main.main\n\t/home/jenkins/agent/workspace/pingcap/tidb/ghpr_check/tidb/cmd/explaintest/main.go:694\nruntime.main\n\t/usr/local/go/src/runtime/proc.go:250"]

4. What is your TiDB version? (Required)