fix: Update testNonExistingUrl to testNonExistingHtmlResource, use not exist classpath resource

Signed-off-by: gongzhongqiang <gongzhongqiang@apache.org>

Author: GOODBOY008

document-readers/jsoup-reader/src/test/java/org/springframework/ai/reader/jsoup/JsoupDocumentReaderTests.java

@@ -177,8 +177,8 @@ void testParseBodyFragment() {
 	}
 
 	@Test
-	void testNonExistingUrl() {
-		JsoupDocumentReader reader = new JsoupDocumentReader("https://nonexistingurl.com",
+	void testNonExistingHtmlResource() {
+		JsoupDocumentReader reader = new JsoupDocumentReader("classpath:/non-existing.html",
 				JsoupDocumentReaderConfig.builder().build());
 		assertThatThrownBy(reader::get).isInstanceOf(RuntimeException.class);
 	}