Upgrade to Apache HttpClient 5.4

This commit also updates the external Javadoc link to avoid the following
warning in the build.

URL https://hc.apache.org/httpcomponents-client-5.2.x/current/httpclient5/apidocs/package-list was redirected to https://hc.apache.org/httpcomponents-client-5.4.x/current/httpclient5/apidocs/package-list

Closes gh-33587

spring-web/src/main/java/org/springframework/http/client/HttpComponentsClientHttpRequestFactory.java

@@ -205,6 +205,7 @@ public class HttpComponentsClientHttpRequestFactory implements ClientHttpRequest
 
 
 	@Override
+	@SuppressWarnings("deprecation")
 	public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) throws IOException {
 		HttpClient client = getHttpClient();