微服务项目统一管理依赖版本，解决maven引入依赖后的unknown问题

pom文件中使用 进行控制：

    4.0.0

    com.example
    cloud-alibaba
    pom
    1.0-SNAPSHOT

    
        nacos-provider8001
        nacos-consumer9001
        nacos-config
        openFeign-provider8002
        openFeign-consumer9002
    

    
    
        UTF-8
        1.8
        1.8
        2.2.2.RELEASE
        Hoxton.SR3
        2.2.1.RELEASE
        1.18.20
    
	
    
        
            
            
                org.springframework.boot
                spring-boot-dependencies
                ${spring.boot.version}
                pom
                import
            
            
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring.cloud.version}
                pom
                import
            
            
            
                com.alibaba.cloud
                spring-cloud-alibaba-dependencies
                ${spring.cloud.alibaba.version}
                pom
                import
            
            
            
                org.projectlombok
                lombok
                ${lombok.version}
                import
            
        
    
	
 
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin