Delete pr.yml

.github/workflows/pr.yml

-# 版权 @2022 凹语言 作者。保留所有权利。
-
-name: Close PRs
-
-on:
-  pull_request_target:
-    types: [opened]
-
-jobs:
-  run:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: superbrothers/close-pull-request@v3
-      with:
-        # Optional. Post a issue comment just before closing a pull request.
-        comment: "暂不收补丁，如果有共建需求请入群交流。We do not accept PRs, please join the dev team at first."