dev-requirements.txt: Require pytest-attrib>=0.1.3
dev-requirements.txt: Require pytest-attrib>=0.1.3

Bug: T136074
Change-Id: I277408dc353197702a6353cd0e3e0ba563e439e7

PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core,wikimedia/pywikibot-core