Encoding issue when exporting as COCO via API

**Describe the bug**
When exporting in COCO format via API, the resulting file is not valid JSON, and something is off with the encoding where my system thinks it's a binary file. Exporting as JSON with the API works normally, and exporting as COCO in the UI works too.

I've only tried image datasets for object detection with bounding boxes, but I'm not sure that's relevant.

**To Reproduce**:
`curl -X GET http://localhost:8080/api/projects//export?exportType=COCO\&download_all_tasks=true\&download_resources=false -H 'Authorization: Token ' --output 'annotations.json'`

^ Replace the project ID and token with valid values, try to read `annotations.json`. It also happens without the `download_all_tasks` and `download_resources` flags

**Expected behavior**
COCO json saved to `annotations.json`

**Environment (please complete the following information):**
- OS: mac
- Label Studio Version v1.11.0