build: remove useless maven-source-plugin

[yndu13]

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[yndu13]

不需要插件配置maven-source-plugin，我们发布时会显式调用mvn source:jar。maven-source-plugin 3.3.1版本会强制校验冲突，不能配置多次。报错：Failed to execute goal org.apache.maven.plugins:maven-source-plugin:3.3.1:jar (attach-sources) on project tea: Presumably you have configured maven-source-plugin to execute twice in your build. You have to configure a classifier for at least one of them.
当没有额外的source目标需求（除source:jar以外），则可以不显式配置。