Make .gitkeep icon use VCS icon (#6931)

This should be a standard recognized by everyone

```bash
mkdir todo
touch todo/.gitkeep # just placeholder
git add todo
git commit
```

Release Notes:

- Added icon for `.gitkeep` files.
e38489196dd1y committed on 1/28/2024, 2:30:30 PM· committed by GitHubparent3493e71
1 file changedLine totals unavailable