The timezone.useUTC option is currently deprecated, and it's recommended to use the time.timezone setting. You can set this property to undefined and it should fall back to the local browser time zone.
timezone.useUTC
time.timezone
undefined
time: { timezone: undefined }
Demo: https://jsfiddle.net/BlackLabel/9kdb8er4/
API: https://api.highcharts.com/highcharts/time.timezone