package/python-validators: bump version to 0.12.6

Includes a number of post-0.12.2 fixes, including a python 3.7 compatibility
fix:

https://github.com/kvesteri/validators/blob/master/CHANGES.rst

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2 files changed