fix: 토큰 생성 시 가장 최근의 기수로 생성되도록 수정

mashup-member/src/main/java/kr/mashup/branding/facade/member/MemberFacadeService.java

@@ -176,7 +176,7 @@ public void changePassword(
     }
 
     private MemberGeneration getLatestMemberGeneration(Member member) {
-        return member.getMemberGenerations().stream().min(Comparator.comparing(
+        return member.getMemberGenerations().stream().max(Comparator.comparing(
             memberGeneration -> memberGeneration.getGeneration().getNumber()
         )).orElseThrow(GenerationIntegrityFailException::new);
     }