Update POJO sample to use webflux

spring-cloud-function-samples/function-sample-pojo/pom.xml

@@ -26,7 +26,7 @@
 	<dependencies>
 		<dependency>
 			<groupId>org.springframework.cloud</groupId>
-			<artifactId>spring-cloud-starter-function-web</artifactId>
+			<artifactId>spring-cloud-starter-function-webflux</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>

spring-cloud-function-samples/function-sample-pojo/src/test/java/com/example/SampleApplicationTests.java

@@ -86,7 +86,7 @@ public class SampleApplicationTests {
 		map.put("B", Arrays.asList("5", "6"));
 
 		assertThat(new TestRestTemplate().exchange(RequestEntity.post(new URI("http://localhost:" + port + "/sum"))
-				.accept(MediaType.APPLICATION_JSON).contentType(MediaType.MULTIPART_FORM_DATA)
+				.accept(MediaType.APPLICATION_JSON).contentType(MediaType.APPLICATION_FORM_URLENCODED)
 				.body(map), String.class).getBody())
 				.isEqualTo("[{\"A\":6,\"B\":11}]");
 	}