ci(github): fix developer bug report template extension

Author: ivangabriele

.github/ISSUE_TEMPLATE/config.yml

@@ -1,7 +1,7 @@
 blank_issues_enabled: false
 contact_links:
   - name: Developer Bug Report
-    url: https://github.com/ivangabriele/openai-autogen-dev-studio/issues/new?template=developer_bug_report.md
+    url: https://github.com/ivangabriele/openai-autogen-dev-studio/issues/new?template=developer_bug_report.yml
     about: File a bug report as a developer (issues related to the source code).
   - name: Feature Request
     url: https://github.com/ivangabriele/openai-autogen-dev-studio/discussions/categories/feature-request-proposals