fix: Update Dataset class to use java.sql.Date for date field to fix sorting after date

src/main/java/de/uni_passau/fim/PADAS/group3/DataDash/model/Dataset.java

@@ -3,6 +3,7 @@ package de.uni_passau.fim.PADAS.group3.DataDash.model;
 import java.net.URL;
 import java.time.LocalDate;
 import java.util.UUID;
+import java.sql.Date;
 
 import jakarta.persistence.Entity;
 import jakarta.persistence.EnumType;
@@ -29,7 +30,7 @@ public class Dataset {
 
     private String author;
 
-    private LocalDate date;
+    private Date date;
 
     private float raiting;
 
@@ -73,7 +74,7 @@ public class Dataset {
     }
 
     public LocalDate getDate() {
-        return date;
+        return date.toLocalDate();
     }
 
     public String getDescription() {
@@ -121,7 +122,7 @@ public class Dataset {
     }
     
     public void setDate(LocalDate localDate) {
-        this.date = localDate;
+        this.date = Date.valueOf(localDate);
     }
     
     public void setDescription(String description) {