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