🐛 update 메소드 전부에 @transactional 추가

Author: cheshireHYUN

src/main/java/com/boggle_boggle/bbegok/oauth/service/CustomOAuth2UserService.java

@@ -72,6 +72,7 @@ protected OAuth2User process(OAuth2UserRequest userRequest, OAuth2User user) {
         return UserPrincipal.create(savedUser, user.getAttributes());
     }
 
+    @Transactional
     public void updateUser(User user, OAuth2UserInfo userInfo) {
         log.debug("### OAUTH2 EMAIL <1> : {}", userInfo.getEmail());
         if(userInfo.getEmail() == null) return;