Remove unused import in AntarcticaTimeZones.java

Eliminated the unnecessary `Collectors` import to improve code clarity and maintainability. This change helps reduce clutter and avoids confusion about unused dependencies in the file.

src/main/java/datetime/AntarcticaTimeZones.java

@@ -4,7 +4,6 @@
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
 import java.util.List;
-import java.util.stream.Collectors;
 
 import static java.util.Comparator.comparingInt;