"update pr-auditor workflow" (#60)

Author: burmudar

.github/workflows/pr-auditor.yml

@@ -8,13 +8,14 @@ jobs:
   check-pr:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-        with: { repository: 'sourcegraph/sourcegraph' }
-      - uses: actions/setup-go@v2
-        with: { go-version: '1.18' }
+      - uses: actions/checkout@v3
+        with:
+          repository: 'sourcegraph/pr-auditor'
+      - uses: actions/setup-go@v4
+        with: { go-version: '1.20' }
 
-      - run: ./dev/pr-auditor/check-pr.sh
+      - run: './check-pr.sh'
         env:
           GITHUB_EVENT_PATH: ${{ env.GITHUB_EVENT_PATH }}
-          GITHUB_TOKEN: ${{ secrets.CODENOTIFY_GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ github.token }}
           GITHUB_RUN_URL: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}