chore: change default bug priority from p2 to p3 (#2460)

Author: meltsufin

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-labels: 'type: bug, priority: p2'
+labels: 'type: bug, priority: p3'
 ---
 
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