ci: bump auto-label-merge-conflicts commit hash (#21704)
* fix: replace broken mschilde action with eps1lon in label-conflicts workflow
mschilde/auto-label-merge-conflicts uses a Docker-based action where
node:alpine no longer ships yarn, causing the build to fail. Replaced
with eps1lon/actions-label-merge-conflict@v3.0.3 (JS-based, no Docker).
Also added pull_request trigger alongside pull_request_target.
* update the hash
* trigegr:ci
* add pull_request event types to label conflicts workflow
* remove pr event