fix: add required requester for pygithub 2.6.0 support

Author: kaosx5s

tests/utils.py

@@ -9,4 +9,5 @@ def create_github_content_file(file=None):
         f = open(f'./tests/fixtures/{file}', 'r')
         contents = str(base64.b64encode(bytearray(f.read(), 'utf-8')), 'utf-8')
         attributes = {'name': file, 'path': f'/{file}','encoding': 'base64','content': contents}
-        return ContentFile.ContentFile(None, {}, attributes)
+        requester = {'is_not_lazy': True}
+        return ContentFile.ContentFile(requester, {}, attributes, complete=True)