python-django: bump version to 1.11.16

Fixes a race condition in QuerySet.update_or_create() that could result in
data loss:

https://code.djangoproject.com/ticket/29499

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit feb811f56756bdbbbdd5a2230545462d46b2ea61)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2 files changed