[pkg] Require python3-compatible versions of eac and skos

Still avoid 0.9.0 version of cubicweb-eac which contains breaking
changes.

cubicweb_seda/__pkginfo__.py

@@ -16,8 +16,8 @@ web = 'http://www.cubicweb.org/project/%s' % distname
 __depends__ = {
     'cubicweb': '>= 3.25.4, < 3.27',
     'six': '>= 1.4.0',
-    'cubicweb-eac': None,
-    'cubicweb-skos': '>= 1.3.0',
+    'cubicweb-eac': '>= 0.8.3, < 0.9.0',
+    'cubicweb-skos': '>= 1.6.0',
     'cubicweb-compound': '>= 0.7',
     'cubicweb-relationwidget': '>= 0.4',
     'cubicweb-squareui': None,