Fix CircleCI lint error

Author: deliahu

build/lint.sh

@@ -49,6 +49,7 @@ if ! command -v black >/dev/null 2>&1; then
   exit 1
 fi
 
+go mod tidy
 go vet "$ROOT/..."
 
 output=$(golint "$ROOT/..." | grep -v "comment" || true)

go.mod

@@ -67,7 +67,7 @@ require (
 	golang.org/x/time v0.0.0-20210611083556-38a9dc6acbc6 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
 	google.golang.org/genproto v0.0.0-20210701133433-6b8dcf568a95 // indirect
-	google.golang.org/grpc v1.39.0
+	google.golang.org/grpc v1.39.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/karalabe/cookiejar.v2 v2.0.0-20150724131613-8dcd6a7f4951
 	gopkg.in/segmentio/analytics-go.v3 v3.1.0