feat!: upgrade CubicWeb to version 4

cubicweb_s3storage/__pkginfo__.py

@@ -15,8 +15,7 @@
 web = f"https://forge.extranet.logilab.fr/cubicweb/cubes/{distname}"
 
 __depends__ = {
-    "cubicweb": ">= 3.24.7, < 3.39.0",
-    "six": ">= 1.4.0",
+    "cubicweb": ">= 4.0.0, < 5.0.0",
     "boto3": None,
 }
 __recommends__ = {}