Christoph Schmidtmeier

Add a new option `target_version` while allows you to set your python verion (analogous to `--target-version`)

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To support the new match..case syntax you need to instruct black to use a newer python version. This is done with `--target-version` (as mentioned [here](https://github.com/psf/black/issues/2242)). This PR adds support for...