ci: remove labeler from EOL stable-2.13 (#1912)

Fixes, including security-related ones, are no longer being backported
to the PR labeler on EOL branches, so I'd like to remove it outright.

.github/workflows/labeler.yml

@@ -1,61 +0,0 @@
----
-# Copyright (C) 2023 Maxwell G <maxwell@gtmx.me>
-# SPDX-License-Identifier: GPL-3.0-or-later
-
-"on":
-  pull_request_target:
-  issues:
-    types:
-      - opened
-  workflow_dispatch:
-    inputs:
-      type:
-        required: true
-        type: choice
-        options:
-          - issue
-          - pr
-      number:
-        required: true
-        type: number
-
-name: "Triage Issues and PRs"
-
-permissions:
-  issues: write
-  pull-requests: write
-
-jobs:
-  label_prs:
-    runs-on: ubuntu-latest
-    name: "Label Issue/PR"
-    steps:
-      - name: Print event information
-        env:
-          event_json: "${{ toJSON(github.event) }}"
-        run: |
-          echo "${event_json}"
-      - name: Checkout parent repository
-        uses: actions/checkout@v4
-      - name: Install Python 3.11
-        uses: actions/setup-python@v4
-        with:
-          python-version: "3.11"
-      - name: Setup venv
-        run: |
-          python -m venv venv
-          ./venv/bin/pip install -r hacking/pr_labeler/requirements.txt
-      - name: "Run the issue labeler"
-        if: "github.event.issue || inputs.type == 'issue'"
-        env:
-          event_json: "${{ toJSON(github.event) }}"
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run:
-          ./venv/bin/python hacking/pr_labeler/label.py issue ${{ github.event.issue.number || inputs.number }}
-      - name: "Run the PR labeler"
-        if: "github.event.pull_request || inputs.type == 'pr'"
-        env:
-          event_json: "${{ toJSON(github.event) }}"
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run:
-          ./venv/bin/python hacking/pr_labeler/label.py pr ${{ github.event.number || inputs.number }}