chore: http basic 제거

Author: dlsrks1021

backend/src/main/java/io/f1/backend/global/config/SecurityConfig.java

@@ -84,7 +84,6 @@ public SecurityFilterChain userFilterChain(HttpSecurity http) throws Exception {
                                                         userInfo.userService(
                                                                 customOAuthUserService))
                                         .successHandler(oAuthSuccessHandler))
-                .httpBasic(Customizer.withDefaults())
                 .logout(
                         logout ->
                                 logout.logoutUrl("/logout")