disable periodic labeler (#1112)

.github/workflows/periodic-labeler.yml

@@ -1,17 +0,0 @@
----
-name: Pull request labeler
-on:
-  schedule:
-    - cron: '*/5 * * * *'
-jobs:
-  labeler:
-    runs-on: ubuntu-latest
-    steps:
-      # if we are to change the labeler version from v0.0.2
-      # we must review the code for that version
-      # to make sure there are no leaks or exploits
-      - uses: paulfantom/periodic-labeler@v0.0.2
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          GITHUB_REPOSITORY: ${{ github.repository }}
-          LABEL_MAPPINGS_FILE: .github/labeler.yml