fix: update bug template (aws#2679)

Author: ahsan-z-khan

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: File a report to help us reproduce and fix the problem
 title: ''
-labels: ''
+labels: 'bug'
 assignees: ''
 
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