update giac to the latest version - probably related to the problem on #27385

from the source at www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_1.5.0-63.*

produced tarball: http://users.ox.ac.uk/~coml0531/sage/giac-1.5.0.63.tar.bz2

Upstream: Fixed upstream, in a later stable release.

CC: @embray @kiwifb @sagetrac-parisse

Component: packages: standard

Author: Dima Pasechnik

Branch/Commit: 132f560

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/28101