CI: Remove merge conflict bot for now

.github/workflows/main.yml

@@ -1,12 +0,0 @@
-on:
-  push:
-    branches:
-      - master
-jobs:
-  triage:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: mschilde/auto-label-merge-conflicts@master
-        with:
-          CONFLICT_LABEL_NAME: "Has Conflicts"
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}