Revert "Build: Upgrades to go 1.12.3 (#16491)" (#16544)

This reverts commit 44b365028f.

pkg/models/dashboard_version.go

@@ -32,16 +32,8 @@ type DashboardVersion struct {
 // associated with the UserIds, overriding the field with the same name from
 // the DashboardVersion model.
 type DashboardVersionMeta struct {
-	Id            int64     `json:"id"`
-	DashboardId   int64     `json:"dashboardId"`
-	ParentVersion int       `json:"parentVersion"`
-	RestoredFrom  int       `json:"restoredFrom"`
-	Version       int       `json:"version"`
-	Created       time.Time `json:"created"`
-
-	Message   string           `json:"message"`
-	Data      *simplejson.Json `json:"data"`
-	CreatedBy string           `json:"createdBy"`
+	DashboardVersion
+	CreatedBy string `json:"createdBy"`
 }
 
 // DashboardVersionDTO represents a dashboard version, without the dashboard