fix: delete unused import

Author: erie0210

example/spring-data-mongodb/src/main/kotlin/com/github/inflab/example/spring/data/mongodb/repository/SortRepository.kt

@@ -2,9 +2,7 @@ package com.github.inflab.example.spring.data.mongodb.repository
 
 import com.github.inflab.spring.data.mongodb.core.aggregation.aggregation
 import org.bson.Document
-import org.springframework.data.domain.Sort
 import org.springframework.data.mongodb.core.MongoTemplate
-import org.springframework.data.mongodb.core.aggregation.Aggregation
 import org.springframework.data.mongodb.core.aggregation.AggregationResults
 import org.springframework.data.mongodb.core.query.TextCriteria
 import org.springframework.stereotype.Repository