Upgrade xorm to v0.8.0 (#8536)

models/unit_tests.go

@@ -17,11 +17,11 @@ import (
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/setting"
 
-	"github.com/go-xorm/xorm"
 	"github.com/stretchr/testify/assert"
 	"github.com/unknwon/com"
 	"gopkg.in/testfixtures.v2"
 	"xorm.io/core"
+	"xorm.io/xorm"
 )
 
 // NonexistentID an ID that will never exist