can't trigger workflow run when in sub directory of git repository

**Describe the bug**

If you open the sub directory of a git repository, click `Trigger workflow` button will do nothing. But can trigger in the root directory of the repository.

<img width="1255" alt="image" src="https://github.com/github/vscode-github-actions/assets/41773861/11d137bf-4c05-4ee7-a23a-bd723ceb88be">


**Extension Version**

v0.26.3


