Update mongo.test.ts

Author: vkarpov15

test/types/mongo.test.ts

@@ -2,8 +2,6 @@ import * as mongoose from 'mongoose';
 import { expectType } from 'tsd';
 import * as bson from 'bson';
 
-import GridFSBucket = mongoose.mongo.GridFSBucket;
-
 function gh12537() {
   const schema = new mongoose.Schema({ test: String });
   const model = mongoose.model('Test', schema);
@@ -16,4 +14,4 @@ function gh12537() {
   doc._id = new bson.ObjectId('somehex');
 }
 
-gh12537();
+gh12537();