fix(repo-assist): set GH_TOKEN on pre-activation check step (#2911)

Author: Jguer

.github/workflows/repo-assist.lock.yml

@@ -32,6 +32,8 @@ on:
     pull-requests: read
   steps:
     - id: check
+      env:
+        GH_TOKEN: ${{ github.token }}
       run: |
         MAX_OPEN_PRS=8
         if [[ "$GITHUB_EVENT_NAME" != "schedule" ]]; then exit 0; fi