remove unused import

Author: Picazsoo

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/SpringPageableScanUtils.java

@@ -24,7 +24,6 @@
 import io.swagger.v3.oas.models.parameters.Parameter;
 import org.openapitools.codegen.utils.ModelUtils;
 
-import java.math.BigDecimal;
 import java.util.*;
 import java.util.stream.Collectors;