[mod] ci: remove checker

Missed on https://github.com/searxng/searxng/pull/5767

.github/workflows/checker.yml

@@ -1,48 +0,0 @@
----
-name: Checker
-
-# yamllint disable-line rule:truthy
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 4 * * 5"
-
-concurrency:
-  group: ${{ github.workflow }}
-  cancel-in-progress: false
-
-permissions:
-  contents: read
-
-env:
-  PYTHON_VERSION: "3.14"
-
-jobs:
-  search:
-    if: github.repository_owner == 'searxng' || github.event_name == 'workflow_dispatch'
-    name: Search
-    runs-on: ubuntu-24.04-arm
-    steps:
-      - name: Setup Python
-        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
-        with:
-          python-version: "${{ env.PYTHON_VERSION }}"
-
-      - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
-        with:
-          persist-credentials: "false"
-
-      - name: Setup cache Python
-        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306  # v5.0.3
-        with:
-          key: "python-${{ env.PYTHON_VERSION }}-${{ runner.arch }}-${{ hashFiles('./requirements*.txt') }}"
-          restore-keys: |
-            python-${{ env.PYTHON_VERSION }}-${{ runner.arch }}-
-          path: "./local"
-
-      - name: Setup venv
-        run: make V=1 install
-
-      - name: Search checker
-        run: make search.checker