[compat] Remove deprecated functions from core code

yt_dlp/extractor/curiositystream.py

@@ -1,12 +1,8 @@
 import re
 
 from .common import InfoExtractor
-from ..utils import (
-    int_or_none,
-    urlencode_postdata,
-    compat_str,
-    ExtractorError,
-)
+from ..compat import compat_str
+from ..utils import ExtractorError, int_or_none, urlencode_postdata
 
 
 class CuriosityStreamBaseIE(InfoExtractor):
@@ -50,7 +46,7 @@ class CuriosityStreamIE(CuriosityStreamBaseIE):
     IE_NAME = 'curiositystream'
     _VALID_URL = r'https?://(?:app\.)?curiositystream\.com/video/(?P<id>\d+)'
     _TESTS = [{
-        'url': 'https://app.curiositystream.com/video/2',
+        'url': 'http://app.curiositystream.com/video/2',
         'info_dict': {
             'id': '2',
             'ext': 'mp4',