Update bug-report-analyzer to use gpt-5.4 model (#1673)

Agent-Logs-Url: https://github.com/meshtastic/Meshtastic-Apple/sessions/2388c071-ccd5-4875-b092-ff60b0a3a5ae

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: garthvh <1795163+garthvh@users.noreply.github.com>

Author: Copilot

.github/workflows/bug-report-analyzer.yml

@@ -71,7 +71,7 @@ jobs:
                   'Content-Type': 'application/json',
                 },
                 body: JSON.stringify({
-                  model: 'gpt-4o-mini',
+                  model: 'gpt-5.4',
                   messages: [
                     { role: 'system', content: systemMessage },
                     { role: 'user',   content: userMessage   },