[Dependency] Replace constant minimum space required with data from jsons

[radujipa]

When doing dependency checking, use the data retrieved with get_latest_os_info() to replace REQUIRED_MB with os_info['compressed_size'] (see json). Do not forget to add some small size (like 50MB for example).

[Ealdwulf]

@rluz The idea of this one is that the burner should work if there is enough space for the image (compressed +uncompressed +50Mb leeway) and give an informative error otherwise. But I doubt this is s a problem for many people so feel free to deprioritize.