Error: unexpected end of JSON input

I suddenly can't deploy anymore with `doctl`.

I'm just doing
`./doctl serverless deploy --remote-build --verbose-build .`

and am getting the following error:
`Error: unexpected end of JSON input`.

I tried:

- Update to the newest version via `brew` (I'm on macOS)
- Downloading the macOS binary and running `./doctl`
- Switched to my Ubuntu machine and downloaded the latest `doctl` and tried the same. Same error.

I'd really like to deploy the fixes to my server less function but I can't.