dont break on debug logs

[jakekaplan]

The retrieved task definition looks something like this:

{'compatibilities': ['EC2', 'FARGATE'],
 'containerDefinitions': [{'cpu': 0,
                           'environment': [],
                           'essential': True,
                           'image': 'prefecthq/prefect:2-python3.10',
                           'mountPoints': [],
                           'name': 'prefect',
                           'portMappings': [],
                           'volumesFrom': []}],
 'cpu': '1024',
 'family': 'prefect__ecs-task-flow__ecs-task-deployment',
 'memory': '2048',
 'networkMode': 'awsvpc',
 'placementConstraints': [],
 'registeredAt': datetime.datetime(2023, 2, 23, 16, 52, 39, 140000, tzinfo=tzlocal()),
 'registeredBy': 'arn:aws:sts::576866164297:assumed-role/AWSReservedSSO_PowerUserAccess_8115307ed553845e/andrew.h@prefect.io',
 'requiresAttributes': [{'name': 'com.amazonaws.ecs.capability.docker-remote-api.1.18'},
                        {'name': 'ecs.capability.task-eni'}],
 'requiresCompatibilities': ['FARGATE'],
 'revision': 1,
 'status': 'ACTIVE',
 'taskDefinitionArn': 'arn:aws:ecs:us-east-2:576866164297:task-definition/prefect__ecs-task-flow__ecs-task-deployment:1',
 'volumes': []}

this can't be json.dumps because of the datetime. This pr changes json.dumps to default to str if we can't serialize

[zzstoatzz]

👍🏼