Update to versions which work with zope.interface 5.

ztk-versions.cfg

@@ -12,7 +12,7 @@ zope.catalog = 4.2.1
 zope.component = 4.6.1
 zope.componentvocabulary = 2.2.0
 zope.configuration = 4.4.0
-zope.container = 4.3.0
+zope.container = 4.4.0
 zope.contentprovider = 4.2.1
 zope.contenttype = 4.5.0
 zope.copy = 4.2
@@ -25,7 +25,7 @@ zope.dublincore = 4.2.0
 zope.error = 4.5.0
 zope.event = 4.4
 zope.exceptions = 4.3
-zope.filerepresentation = 4.2.0
+zope.filerepresentation = 5.0.0
 zope.formlib = 4.7.1
 zope.hookable = 5.0.1
 zope.i18n = 4.7.0
@@ -54,7 +54,7 @@ zope.security = 5.1.1
 zope.securitypolicy = 4.3.1
 zope.sendmail = 5.0
 zope.session = 4.3.0
-zope.site = 4.2.2
+zope.site = 4.3.0
 zope.size = 4.3
 zope.structuredtext = 4.3
 zope.tal = 4.4