Trivial yaml fixes for linter. (#12725)

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -2,7 +2,7 @@ name: 'Bug Report'
 description: 'Report a bug to help us improve Gemini CLI'
 labels:
   - 'status/need-triage'
-type: Bug
+type: 'Bug'
 body:
   - type: 'markdown'
     attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -2,7 +2,7 @@ name: 'Feature Request'
 description: 'Suggest an idea for this project'
 labels:
   - 'status/need-triage'
-type: Feature
+type: 'Feature'
 body:
   - type: 'markdown'
     attributes: