chore: 去掉一个workflow

.github/workflows/lgtm.yml

@@ -1,18 +0,0 @@
-name: Send LGTM reaction
-
-on:
-  issue_comment:
-    types: [created]
-  pull_request_review:
-    types: [submitted]
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@1.0.0
-      - uses: micnncim/action-lgtm-reaction@master
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          trigger: '["^.?lgtm$"]'