Revert "Add GitHub action for labelling PRs"

This reverts commit 0ff13dcf.

.github/workflows/labeler.yml

@@ -1,17 +0,0 @@
-name: Label PRs
-
-on:
-  pull_request_target:
-    types: [opened, synchronize, reopened]
-
-permissions:
-  contents: read
-  pull-requests: write
-
-jobs:
-  label:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/labeler@v5
-        with:
-          configuration-path: .github/labeler.yml