Remove unnecessary dependency

https://github.com/platformio/platformio-core/commit/bce70d49450368134f20f1486b60c641f224b833

According to namcap there are 2 more:

platformio-core W: Dependency included, but may not be needed ('python-colorama')
platformio-core W: Dependency included, but may not be needed ('python-aiofiles')
platformio-core W: Dependency included, but may not be needed ('python-wsproto')

however the remaining ones are specified as dependencies by upstream, so I'm not sure about them.