package/python-segno: add missing python3-{pyexpat, zlib} dependencies

The last version bump removed python-setuptools runtime dependency
but doing so also removed the python3-pyexpat and python3-zlib
runtime depdencies [1] that are actually direct runtime
dependencies.

[1] 081162580f99d1a68133f7f513bf2cd6d1b8b6b6

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/6477656982 (TestPythonPy3Segno)

Cc: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
1 file changed