chore: Use unprivileged trigger for Conventional Commits workflow (#184)

fix: use unprivileged event for pull request title linting

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: arjenkroezen-msft <320553332+arjenkroezen-msft@users.noreply.github.com>

Author: Copilot

.github/workflows/conventional-commits.yml

@@ -1,7 +1,7 @@
 ---
 name: Conventional Commits
 on:
-  pull_request_target:
+  pull_request:
     types:
       - opened
       - reopened