Fix labels on issue templates

PiperOrigin-RevId: 342577869

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,8 +2,7 @@
 name: Bug report
 about: Create a bug report to help us improve
 title:
-labels:
-  - 'type: bug'
+labels: 'type: bug'
 assignees: ''
 ---
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,8 +2,7 @@
 name: Feature request
 about: Suggest an idea or improvement
 title: ''
-labels:
-  - 'type: enhancement'
+labels: 'type: enhancement'
 assignees: ''
 ---