fix: 规范数据库事物的使用，解决在swoole环境下可能会出现事物一直不被提交的问题

app/Http/Controllers/V1/Admin/KnowledgeController.php

@@ -77,18 +77,18 @@ class KnowledgeController extends Controller
 
     public function sort(KnowledgeSort $request)
     {
-        DB::beginTransaction();
         try {
+            DB::beginTransaction();
             foreach ($request->input('knowledge_ids') as $k => $v) {
                 $knowledge = Knowledge::find($v);
                 $knowledge->timestamps = false;
                 $knowledge->update(['sort' => $k + 1]);
             }
+            DB::commit();
         } catch (\Exception $e) {
             DB::rollBack();
             throw new ApiException(500, '保存失败');
         }
-        DB::commit();
         return response([
             'data' => true
         ]);