[iOS] Fix parsing string without seconds

[romanyczn1]

On ios im getting an exception when trying to Instant.parse string without seconds "Failed to parse an instant from '2024-04-01T15:30+03:00'" "Position 16: Expected : but got +"

On android it's behave normally

How can i resolve this?

[dkhalanskyjb]

Duplicate of #369
You can resolve this by defining a custom format:

val format = DateTimeComponents.Format {
  dateTime(LocalDateTime.Formats.ISO)
  offset(UtcOffset.Formats.ISO)
}
Instant.parse("2024-04-01T15:30+03:00", format)