chore: remove unused imports (#59)

Author: mpecan

src/main/kotlin/io/github/mpecan/upsert/type/EnumTypeMapper.kt

@@ -1,10 +1,8 @@
 package io.github.mpecan.upsert.type
 
 import org.hibernate.annotations.JdbcTypeCode
-import org.hibernate.type.SqlTypes
 import org.springframework.core.annotation.Order
 import java.lang.reflect.Field
-import java.sql.Types
 
 /**
  * Type mapper for enum values that converts them to their ordinal values.