ycb_django_pr11790

what a new run launched now would send

AuthenticationForm's username field doesn't set maxlength HTML attribute.
Description
	
AuthenticationForm's username field doesn't render with maxlength HTML attribute anymore.
Regression introduced in #27515 and 5ceaf14686ce626404afb6a5fbd3d8286410bf13.
​https://groups.google.com/forum/?utm_source=digest&utm_medium=email#!topic/django-developers/qnfSqro0DlA
​https://forum.djangoproject.com/t/possible-authenticationform-max-length-regression-in-django-2-1/241

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