GPL violation because of poppler

[Mustafa-eksi]

from https://github.com/DMSrs/poppler-rs:

Warning

libpoppler is based on the GPL-licensed xpdf-3.0
and is unlikely to ever be released under a different license.
As a result, every program or library linking against this crate must be GPL licensed as well.

And you mentioned the same thing in the stream too, you probably forgot to update the license.
I'm not sure if this violates GPL because you never released this software, but it is better to be cautious I guess.