Bump amo-validator

Includes TB21 compat updates

Author: mattbasta

requirements/prod.txt

@@ -93,7 +93,7 @@ suds==0.3.9
 tastypie-services==0.2.2
 
 ## Not on pypi.
--e git+https://github.com/mozilla/amo-validator.git@8adf5827ddd81a8ce450e33f79dd2208bc59012c#egg=amo-validator
+-e git+https://github.com/mozilla/amo-validator.git@cf8b4101e0142a19d0b3836309508610cdb562c1#egg=amo-validator
 -e git+https://github.com/mozilla/app-validator.git@461b979deeef0f869813710d5996c9f7885f4d28#egg=app-validator
 -e git+https://github.com/jsocol/commonware.git@27646ecaca40a89024cc581c3ecf5eb0fa87ee11#egg=commonware
 -e git+https://github.com/jbalogh/django-queryset-transform@a1ba6ae41bd86f5bb9ff66fb56614e0fafe6e022#egg=django-queryset-transform