Update project bootstrap-select to 1.5.4

libgrabber updated project bootstrap-select to 1.5.4.

@silviomoreto

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "bootstrap-select",
    "repo": "silviomoreto/bootstrap-select",
    "files": {
      "basePath": "/",
      "include": ["bootstrap-select.css", "bootstrap-select.min.css", "bootstrap-select.js", "bootstrap-select.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/bootstrap.select",
    "localVersions": ["1.3.4", "1.4.3", "1.5.2"],
    "remoteVersions": ["1.0.0", "1.2.0", "1.3.0", "1.3.1", "1.3.3", "1.3.4", "1.3.5", "1.3.6", "1.3.7", "1.4.0", "1.4.1", "1.4.2", "1.4.3", "1.5.0", "1.5.1", "1.5.2", "1.5.4"],
    "branchVersions": []
  },
  "version": "1.5.4",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/bootstrap.select/1.5.4",
  "branch": "bootstrap-select/1.5.4"
}
```