Add missing @⁠Override annotations

... and suppress "serial" warnings

spring-test/src/main/java/org/springframework/mock/web/MockHttpServletResponse.java

@@ -642,7 +642,7 @@ public class MockHttpServletResponse implements HttpServletResponse {
 		sendRedirect(url, HttpServletResponse.SC_MOVED_TEMPORARILY, true);
 	}
 
-	// @Override - on Servlet 6.1
+	@Override
 	public void sendRedirect(String url, int sc, boolean clearBuffer) throws IOException {
 		Assert.state(!isCommitted(), "Cannot send redirect - response is already committed");
 		Assert.notNull(url, "Redirect URL must not be null");

spring-test/src/main/java/org/springframework/test/web/servlet/client/DefaultRestTestClientBuilder.java

@@ -173,6 +173,7 @@ class DefaultRestTestClientBuilder<B extends RestTestClient.Builder<B>> implemen
 			this.mockMvcBuilder = mockMvcBuilder;
 		}
 
+		@Override
 		public <T extends S> T configureServer(Consumer<M> consumer) {
 			consumer.accept(this.mockMvcBuilder);
 			return self();