Pin zope.interface in oldest tests (#4842)
Pin zope.interface in oldest tests (#4842)

* pin zope.interface in oldest tests

* pin zope.component in oldest tests

stweil/letsencrypt,stweil/letsencrypt,jsha/letsencrypt,lmcro/letsencrypt,letsencrypt/letsencrypt,lmcro/letsencrypt,jsha/letsencrypt,letsencrypt/letsencrypt