update samples

Author: wing328

samples/server/petstore/spring-mvc-default-value/src/main/java/org/openapitools/api/TestHeadersApi.java

@@ -12,7 +12,6 @@
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.data.domain.Pageable;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.multipart.MultipartFile;

samples/server/petstore/spring-mvc-default-value/src/main/java/org/openapitools/api/TestQueryParamsApi.java

@@ -12,7 +12,6 @@
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.data.domain.Pageable;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.context.request.NativeWebRequest;
 import org.springframework.web.multipart.MultipartFile;