Remove OrderedDict usage

We now support only Python 3.7+, this means we can rely on dict being
ordered by order of insertion, and thus no need to use OrderedDict from
collections.

tests/test_stanza_element.py

@@ -1,7 +1,6 @@
 import unittest
 from slixmpp.test import SlixTest
 from slixmpp.xmlstream.stanzabase import ElementBase, register_stanza_plugin, ET
-from collections import OrderedDict
 
 
 class TestElementBase(SlixTest):
@@ -1221,7 +1220,7 @@ class TestElementBase(SlixTest):
             sub_interfaces = interfaces
             lang_interfaces = interfaces
 
-        data = OrderedDict()
+        data = {}
         data['en'] = 'hi'
         data['fr'] = 'bonjour'
         data['no'] = 'hej'

tests/test_stanza_xep_0004.py

@@ -1,7 +1,6 @@
 import unittest
 from slixmpp import Message
 from slixmpp.test import SlixTest
-from collections import OrderedDict
 
 import slixmpp.plugins.xep_0004 as xep_0004
 from slixmpp.xmlstream import register_stanza_plugin
@@ -52,7 +51,7 @@ class TestDataForms(SlixTest):
           </message>
         """)
 
-        fields = OrderedDict()
+        fields = {}
         fields['f1'] = {'type': 'text-single',
                         'label': 'Username',
                         'required': True}
@@ -125,7 +124,7 @@ class TestDataForms(SlixTest):
         msg = self.Message()
         form = msg['form']
 
-        fields = OrderedDict()
+        fields = {}
         fields['f1'] = {'type': 'text-single',
                         'label': 'Username',
                         'required': True}
@@ -173,7 +172,7 @@ class TestDataForms(SlixTest):
         msg = self.Message()
         form = msg['form']
 
-        fields = OrderedDict()
+        fields = {}
         fields['f1'] = {'type': 'text-single',
                         'label': 'Username',
                         'required': True}