YAML save on stream

[alecandido]

@andreab1997 in:
https://github.com/N3PDF/eko/blob/2c9878970a0bc93a537668bd729288e8f2149d7a/src/ekobox/genpdf/export.py#L103-L105
you don't need to instantiate a stream, dump on it and extract the string, since:

cnt = yaml.dump(info, default_flow_style=True, width=100000, line_break="\n")

is doing the exact same :)

[alecandido]

P.S.: already communicated in private, but I decided that discussions are a more proper place to talk about code than emails on Telegram.