fix: replace unsupported gpt-4.1-mini model pin in auto-triage-issues workflow (#28152)

Author: Copilot

.github/workflows/auto-triage-issues.lock.yml

@@ -14,7 +14,7 @@ permissions:
   issues: read
 engine:
   id: copilot
-  model: gpt-4.1-mini
+  model: gpt-5-mini
 strict: true
 network:
   allowed: