Preserve version of maven plugin

[algomaster99]

While transforming the poms of each module, we hardcode the version of surefire to 3.0.0 if it is not already declared. This is not correct for multi-module projects like https://github.com/alibaba/nacos/ because one of the submodules may be inheriting the version from its root/parent module.

Found in commit - alibaba/nacos@0cf9c24. Version 2.20 should be inherited in this case.