Unregister flow sources

curl --request POST \
  --url http://localhost:3370/flow/unregister \
  --header 'Content-Type: application/json' \
  --header 'KODOSUMI_API_KEY: <api-key>' \
  --data '{
  "url": [
    "<string>"
  ]
}'

{
  "deletes": [
    "<string>"
  ]
}