test: fix data race in executor_test.go/checkRequestClient (#7326)
test: fix data race in executor_test.go/checkRequestClient (#7326)


ngaut/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,Nify/tidb,pingcap/tidb,ngaut/tidb,CodeRushing/tidb,cosmtrek/tidb,EvilMcJerkface/tidb,ngaut/tidb,kyle-wang/tidb,CodeRushing/tidb,kyle-wang/tidb,c4pt0r/tidb,coocood/tidb,tiancaiamao/tidb,c4pt0r/tidb,c4pt0r/tidb,kyle-wang/tidb,XuHuaiyu/tidb,qiuyesuifeng/tidb,coocood/tidb,mccxj/tidb,Cofyc/tidb,c4pt0r/tidb,wusphinx/tidb,qiuyesuifeng/tidb,cosmtrek/tidb,ming-relax/tidb,kyle-wang/tidb,Nify/tidb,ngaut/tidb,ming-relax/tidb,Cofyc/tidb,EvilMcJerkface/tidb,ngaut/tidb,kyle-wang/tidb,wusphinx/tidb,tiancaiamao/tidb,pingcap/tidb,XuHuaiyu/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,mccxj/tidb