*: upgrade client-go to fix pessimistic write-conflict (#25984)

go.mod

@@ -55,7 +55,7 @@ require (
 	github.com/shirou/gopsutil v3.21.2+incompatible
 	github.com/soheilhy/cmux v0.1.4
 	github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2
-	github.com/tikv/client-go/v2 v2.0.0-alpha.0.20210701075128-88f909bcdd3f
+	github.com/tikv/client-go/v2 v2.0.0-alpha.0.20210706041121-6ca00989ddb4
 	github.com/tikv/pd v1.1.0-beta.0.20210323121136-78679e5e209d
 	github.com/twmb/murmur3 v1.1.3
 	github.com/uber-go/atomic v1.4.0
@@ -76,7 +76,6 @@ require (
 	golang.org/x/tools v0.1.4
 	google.golang.org/grpc v1.27.1
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
-	honnef.co/go/tools v0.2.0 // indirect
 	modernc.org/mathutil v1.2.2 // indirect
 	sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0
 	sourcegraph.com/sourcegraph/appdash-data v0.0.0-20151005221446-73f23eafcf67

go.sum

@@ -558,8 +558,8 @@ github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2/go.mod h1:2PfK
 github.com/tidwall/gjson v1.3.5/go.mod h1:P256ACg0Mn+j1RXIDXoss50DeIABTYK1PULOJHhxOls=
 github.com/tidwall/match v1.0.1/go.mod h1:LujAq0jyVjBy028G1WhWfIzbpQfMO8bBZ6Tyb0+pL9E=
 github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
-github.com/tikv/client-go/v2 v2.0.0-alpha.0.20210701075128-88f909bcdd3f h1:T3zFmJfdvmF+sVUvLsZKJZmCzfkbo0O0DjlbQdmd74A=
-github.com/tikv/client-go/v2 v2.0.0-alpha.0.20210701075128-88f909bcdd3f/go.mod h1:crzTwbliZf57xC5ZSzmQx4iMZCLCGhA364to+E2JAPU=
+github.com/tikv/client-go/v2 v2.0.0-alpha.0.20210706041121-6ca00989ddb4 h1:kokFPtkpQ2ZH910iuxfmKMk8M9zzCLskN8h1LELWN20=
+github.com/tikv/client-go/v2 v2.0.0-alpha.0.20210706041121-6ca00989ddb4/go.mod h1:crzTwbliZf57xC5ZSzmQx4iMZCLCGhA364to+E2JAPU=
 github.com/tikv/pd v1.1.0-beta.0.20210323121136-78679e5e209d h1:K0XnvsnT6ofLDuM8Rt3PuFQO4p8bNraeHYstspD316g=
 github.com/tikv/pd v1.1.0-beta.0.20210323121136-78679e5e209d/go.mod h1:Jw9KG11C/23Rr7DW4XWQ7H5xOgGZo6DFL1OKAF4+Igw=
 github.com/tklauser/go-sysconf v0.3.4 h1:HT8SVixZd3IzLdfs/xlpq0jeSfTX57g1v6wB1EuzV7M=