更新sync库版本

Author: pixel

server/go.mod

@@ -51,7 +51,7 @@ require (
 	github.com/unrolled/secure v1.0.7
 	go.uber.org/zap v1.10.0
 	golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2 // indirect
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	golang.org/x/tools v0.0.0-20200324003944-a576cf524670 // indirect
 	google.golang.org/protobuf v1.24.0 // indirect
 	gopkg.in/ini.v1 v1.55.0 // indirect