cherkaskyb

# Describe the bug The [get-monthly-usage-attribution](https://docs.datadoghq.com/api/latest/usage-metering/#get-monthly-usage-attribution) endpoint is returning a `YYYY-MM` formatted string under the `usage[].month` field. [This is the validation that fails](https://github.com/DataDog/datadog-api-client-python/blob/61082ee49a9697698d988a2f23be24c4f6c382c5/src/datadog_api_client/model_utils.py#L1057) as the `month` field is defined as...