[FIX] packaging: add python3-renderpm in debian package

In Debian and Ubuntu distros, the python reportlab package provides
multiple binary packages among which python3-reportlab [0] [1] and
python3-renderpm [2] [3]. The latter is only recommended, but is mandatory for
odoo because it's needed for rendering barcode with the `asString` method.

[0] https://packages.debian.org/buster/python3-reportlab
[1] https://packages.ubuntu.com/focal/python3-reportlab
[2] https://packages.debian.org/buster/python3-renderpm
[3] https://packages.ubuntu.com/focal/python3-renderpm



closes odoo/odoo#67391

Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>