Revert "."

This reverts commit f16fbaf1.

component/ZODB/buildout.cfg

@@ -63,6 +63,7 @@ depends = ${persistent:egg} ${BTrees:egg}
 
 egg_versions =
   transaction = 1.7.0
+  ZODB3 = 3.11.0
 
 [ZODB4-repository]
 <= _ZODB-git-repository
@@ -99,6 +100,7 @@ depends = ${persistent:egg} ${BTrees:egg}
 
 egg_versions =
   transaction = 2.4.0
+  ZODB3 = 3.11.0
 
 [ZODB5-repository]
 <= _ZODB-git-repository
@@ -127,6 +129,3 @@ persistent = 4.6.4
 # TODO update to 2.0.0 once NEO stops doing bytes._pack = ...
 # https://lab.nexedi.com/nexedi/slapos/commit/27f574bc
 zodbpickle = 1.0.4
-
-# XXX explain
-ZODB3 = 3.11.0