fix: 공연 링크 문자열 길이 설정

Author: pipi-shortstocking

src/main/java/PodoeMarket/podoemarket/common/entity/PerformanceEntity.java

@@ -37,7 +37,7 @@ public class PerformanceEntity {
     @Column(nullable = false)
     private LocalDate endDate;
 
-    @Column(nullable = false)
+    @Column(nullable = false, columnDefinition = "TEXT")
     private String link;
 
     @Builder.Default