Clean up warnings

spring-web/src/test/java/org/springframework/http/HttpEntityTests.java

@@ -54,6 +54,7 @@ class HttpEntityTests {
 		MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
 		map.set("Content-Type", "text/plain");
 		String body = "foo";
+		@SuppressWarnings("deprecation")
 		HttpEntity<String> entity = new HttpEntity<>(body, map);
 		assertThat(entity.getBody()).isEqualTo(body);
 		assertThat(entity.getHeaders().getContentType()).isEqualTo(MediaType.TEXT_PLAIN);

spring-web/src/test/java/org/springframework/http/server/reactive/HeadersAdaptersTests.java

@@ -123,6 +123,7 @@ class HeadersAdaptersTests {
 	}
 
 	@ParameterizedPopulatedHeadersTest
+	@SuppressWarnings("deprecation")
 	void copyUsingEntrySetPutRemovesDuplicates(MultiValueMap<String, String> headers) {
 		HttpHeaders headers2 = new HttpHeaders();
 		for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
@@ -141,6 +142,7 @@ class HeadersAdaptersTests {
 	}
 
 	@ParameterizedPopulatedHeadersTest
+	@SuppressWarnings("deprecation")
 	void copyUsingPutAllRemovesDuplicates(MultiValueMap<String, String> headers) {
 		HttpHeaders headers2 = new HttpHeaders();
 		headers2.putAll(headers);

spring-web/src/test/java/org/springframework/web/ErrorResponseTests.java

@@ -33,6 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class ErrorResponseTests {
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void createWithHttpHeader() {
 		ErrorResponse response = ErrorResponse.builder(new IllegalStateException(), HttpStatus.BAD_REQUEST, "test")
 				.header("header", "value").build();
@@ -40,6 +41,7 @@ class ErrorResponseTests {
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void createWithHttpHeadersConsumer() {
 		ErrorResponse response = ErrorResponse.builder(new IllegalStateException(), HttpStatus.BAD_REQUEST, "test")
 				.header("header", "value")