Dev: Check Conflicts Remove label does not work

When I resolved conflicts and pushed to the PR branch, "Auto Label "stale" / Check Conflicts" failed.

See #7955

```
Run # MERGEABLE with 'stale' label

# MERGEABLE with 'stale' label
if [ "$(echo $PR_DETAIL | jq -r '.mergeable')" == "MERGEABLE" ] && \
[ "$(echo $PR_DETAIL | jq -r '.labels[] | select(.name == "stale")')" != "" ]; then
# remove 'stale' label
gh pr edit $PR_URL --remove-label "stale"
fi
shell: /usr/bin/bash -e {0}
env:
PR_DETAIL: {"labels":[{"id":"MDU6TGFiZWwyNTMxNTUyNzA=","name":"bug","description":"Verified issues on the current code behavior or pull requests that will fix them","color":"fc2929"},{"id":"MDU6TGFiZWwxMDY5MjIwODIw","name":"stale","description":"Pull requests with conflicts","color":"ed769c"},{"id":"MDU6TGFiZWwyNDQzNTU0NDM1","name":"breaking change","description":"Pull requests that may break existing functionalities","color":"ff0000"},{"id":"LA_kwDOAniwTs8AAAABXsQnNQ","name":"4.5","description":"","color":"0e8a16"}],"mergeable":"MERGEABLE","url":"https://github.com/codeigniter4/CodeIgniter4/pull/7955"}
GITHUB_TOKEN: ***
PR_URL: https://github.com/codeigniter4/CodeIgniter4/pull/7955
GraphQL: Resource not accessible by integration (removeLabelsFromLabelable)
Error: Process completed with exit code 1.
```
https://github.com/codeigniter4/CodeIgniter4/actions/runs/6347432291/job/17242438331?pr=7955

Ref #7959