update build cmd in graceshutdown test makefile

[purelind]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

run 'make' in tests/graceshutdown failed with those logs:

+ cd tests/graceshutdown

+ make

cd /home/jenkins/agent/workspace/pingcap/tidb/merged_e2e_test/tidb && \
CGO_ENABLED=1 GO111MODULE=on go build  -tags codes -ldflags '-X "github.com/pingcap/tidb/pkg/parser/mysql.TiDBReleaseVersion=v7.5.0-alpha-137-g91a80232fc" -X "github.com/pingcap/tidb/pkg/util/versioninfo.TiDBBuildTS=2023-10-17 04:40:59" -X "github.com/pingcap/tidb/pkg/util/versioninfo.TiDBGitHash=91a80232fce8cbc46b40820821ae0c55cb9da573" -X "github.com/pingcap/tidb/pkg/util/versioninfo.TiDBGitBranch=HEAD" -X "github.com/pingcap/tidb/pkg/util/versioninfo.TiDBEdition=Community"' -o /home/jenkins/agent/workspace/pingcap/tidb/merged_e2e_test/tidb/tests/graceshutdown/bin/tidb-server tidb-server/main.go
package tidb-server/main.go is not in std (/usr/local/go/src/tidb-server/main.go)
make: *** [server] Error 1
script returned exit code 2

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

build success

3. What did you see instead (Required)

build failed

4. What is your TiDB version? (Required)

branch master