Change runner from ubuntu-latest to ubuntu-slim

https://github.blog/changelog/2026-01-22-1-vcpu-linux-runner-now-generally-available-in-github-actions/

Author: iBug

.github/workflows/bad-pr.yml

@@ -11,7 +11,7 @@ jobs:
   close-pr:
     permissions:
       pull-requests: write
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     if: "contains(github.event.pull_request.body, 'by deleting this comment block') || github.event.pull_request.body == ''"
     steps:
       - uses: actions-ecosystem/action-add-labels@v1