Why has coverage been locked to `==4.0.3` for two years? Why not `>=4.0.0`?

If I add localstack to my pipenv, I can't lock because of this unnecessary dependency.
import os
import localstack_client.config
VERSION = '0.8.8'
if 'DEFAULT_REGION' not in os.environ:
    os.environ['DEFAULT_REGION'] = 'us-east-1'
DEFAULT_REGION = os.environ['DEFAULT_REGION']
REGION_LOCAL = 'local'
ENV_DEV = 'dev'
DEFAULT_PORT_APIGATEWAY_BACKEND = 4566
DEFAULT_PORT_KINESIS_BACKEND = 4565
DEFAULT_PORT_DYNAMODB_BACKEND = 4564