!!Hotfix: 존재하지 않는 problemSet 참조 해결

[GulSauce]

org.gradle.toolchains.foojay-resolver-convention

로컬에 설정된 JDK 환경변수 값에 구애받지 않게하는 플러그인

• 문제 상황: 기존에는 로컬 환경변수 값을 JDK 25로 바꿨을 경우 빌드오류가 생겼었음
• 이 플러그인의 기능: 별도의 JDK로 빌드를 수행하게해준다

식별된 NPE 문제 상황

모종의 이유로 삭제된 problemSet에 대한 quizHistory가 존재하고 퀴즈기록 API를 호출할 경우 NPE가 발생했었다

2026-05-03 16:02:34.253 error 2026-05-03T07:02:34.251Z ERROR 1 --- [q-asker] [t-handler-16109] c.i.q.g.error.GlobalExceptionHandler     : [예상치 못한 오류] 처리되지 않은 예외 발생
java.lang.NullPointerException: Cannot invoke "com.icc.qasker.quizset.dto.readonly.ProblemSetSummary.id()" because "problemSet" is null
165.246.241.2 - - [03/May/2026:07:02:34 +0000] "GET /history?page=0&size=20 HTTP/1.1" 500 61 "https://www.q-asker.com/" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36" "165.246.241.2"
	at com.icc.qasker.quizhistory.mapper.QuizHistoryMapper.toSummary(QuizHistoryMapper.java:25) ~[quiz-history-impl.jar:na]

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