spring-security 4.2.3 :Please update your schema declarations to the 4.2 schema.

到官方找到对应版本，找到reference文件，修改声明

spring-security 4.2.3    

地址：https://docs.spring.io/spring-security/site/docs/4.2.3.RELEASE/reference/htmlsingle/#ns-config

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:security="http://www.springframework.org/schema/security"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/security
		http://www.springframework.org/schema/security/spring-security.xsd">