software/erp5: remove version pin on Jinja2

It's better for us to use a recent jinja2 version because we use it in
buildout profiles through slapos.recipe.template:jinja2

stack/erp5/zope-versions.cfg

@@ -5,7 +5,8 @@ Acquisition = 2.13.12
 DateTime = 2.12.8
 DocumentTemplate = 2.13.4
 ExtensionClass = 2.13.2
-Jinja2 = 2.8.1
+# we use a newer version in stack/slapos.cfg
+# Jinja2 = 2.8.1
 Missing = 2.13.1
 MultiMapping = 2.13.0
 Paste = 1.7.5.1

stack/erp5/ztk-versions.cfg

@@ -74,7 +74,8 @@ zope.documenttemplate = 3.4.3
 ClientForm = 0.2.10
 distribute = 0.6.49
 docutils = 0.7
-Jinja2 = 2.5.5
+# we use a newer version in stack/slapos.cfg
+# Jinja2 = 2.5.5
 # Newer versions of mechanize are not fully py24 compatible.
 mechanize = 0.1.11
 Paste = 1.7.5.1