Update issue template

[no ci]

Author: Karlatemp

.github/ISSUE_TEMPLATE/bug.yml

@@ -1,7 +1,7 @@
 name: Bug 报告
 description: 提交一个 bug
 labels:
-  - "question"
+  - "z:question"
 
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/feature.md

@@ -2,7 +2,7 @@
 name: 特性申请
 about: 申请 mirai 添加新的特性
 title: ''
-labels: feature
+labels: 't:feature'
 assignees: ''
 
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