use Files.createTempFile in asciidoc tests if possible (#8794)

Author: wing328

modules/openapi-generator/src/test/java/org/openapitools/codegen/asciidoc/IncludeMarkupFilterTest.java

@@ -34,7 +34,7 @@ public void testIncludeMarkupFilterDoesNotIncludeMissingFile() {
     @Test
     public void testIncludeMarkupFilterFoundFileOk() throws IOException {
 
-        File tempFile = File.createTempFile("IncludeMarkupFilterTestDummyfile", "-adoc");
+        File tempFile = Files.createTempFile("IncludeMarkupFilterTestDummyfile", "-adoc").toFile();
         tempFile.deleteOnExit();
 
         final AsciidocDocumentationCodegen generator = new AsciidocDocumentationCodegen();

modules/openapi-generator/src/test/java/org/openapitools/codegen/asciidoc/LinkMarkupFilterTest.java

@@ -2,6 +2,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.util.Map;
 
 import org.mockito.MockitoAnnotations;
@@ -32,7 +33,7 @@ public void testLinkMarkupFilterDoesNotLinkMissingFile() {
     @Test
     public void testLinkMarkupFilterLinksFoundFileOk() throws IOException {
 
-        File tempFile = File.createTempFile("LinkMarkupFilterTestDummyfile", ".adoc");
+        File tempFile = Files.createTempFile("LinkMarkupFilterTestDummyfile", ".adoc").toFile();
         tempFile.deleteOnExit();
 
         final AsciidocDocumentationCodegen generator = new AsciidocDocumentationCodegen();