upgrade plone.dexterity (memory leak) (#11)

versions.cfg

@@ -12,6 +12,22 @@ versions = versions
 version = __CURRENT_VERSION__
 
 [versions]
+# https://github.com/plone/buildout.coredev/blob/5.2/newer-versions.cfg
+
+# plone.dexterity has a fix for a possible memory leak.
+# See https://github.com/plone/Products.CMFPlone/issues/3829
+# Main change is here:
+# https://github.com/plone/plone.dexterity/pull/189
+plone.dexterity = 2.11.0
+
+# The newer plone.dexterity version leads to test failures on Python 3,
+# which may or may not happen in production use as well.  plone.supermodel
+# backports a fix made for the dexterity site root in Plone 6, which
+# helps for this new situation as well.
+# Main change is here:
+# https://github.com/plone/plone.supermodel/pull/55
+plone.supermodel = 1.7.0
+
 # agid-related products
 collective.address = 1.6
 collective.dexteritytextindexer = 2.4.0