chore(deps): Remove "six" dependency since it is only python3 compatible

cubicweb_rqlcontroller/__pkginfo__.py

@@ -15,7 +15,6 @@ web = "http://www.cubicweb.org/project/%s" % distname
 
 __depends__ = {
     "cubicweb": ">= 3.32.2",
-    "six": None,
 }
 __recommends__ = {"cubicweb-signedrequest": None}
 

cubicweb_rqlcontroller/views.py

@@ -20,8 +20,6 @@
 import json
 import re
 
-from six import string_types
-
 from cubicweb.predicates import (
     ExpectedValuePredicate,
     match_form_params,
@@ -42,7 +40,7 @@ DATARE = re.compile(r"__f(?P<ref>.+)$")
 
 def rewrite_args(args, output, form):
     for k, v in args.items():
-        if not isinstance(v, string_types):
+        if not isinstance(v, str):
             continue
         match = ARGRE.match(v)
         if match: