Pom.xml <parent> The version under the element can be in the form of a placeholder

## Issue Description

Type: *bug report* or *feature request*

### Describe what happened (or what feature you want)
每次要修改版本号的时候，基本上是每个pom.xml都要修改

### Describe what you expected to happen
要修改版本号的时候，希望只需要修改一个地方就好

### How to reproduce it (as minimally and precisely as possible)

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### Tell us your environment

### Anything else we need to know?