Update web.xml xsd references to for 3.1 version

See gh-29075

Author: philwebb

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-traditional/src/main/webapp/WEB-INF/web.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<web-app version="3.1" xmlns="http://java.sun.com/xml/ns/javaee"
+<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee "
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
+	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
 
 	<servlet>
 		<servlet-name>appServlet</servlet-name>