package/janet: bump to version 1.21.2
Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit fc440e46396bf7942b539a5542a71e5232708379)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>