chore: API 응답 속성명 변경

src/main/java/today/seasoning/seasoning/solarterm/dto/SolarTermDto.java

@@ -10,7 +10,7 @@
 public class SolarTermDto {
 
     private final int sequence;
-    private final LocalDate localDate;
+    private final LocalDate date;
 
     public static SolarTermDto build(SolarTerm solarTerm) {
         return new SolarTermDto(solarTerm.getSequence(), solarTerm.getDate());