feat: adding python3.11 support.

cookiecutter-xblock/{{cookiecutter.repo_name}}/{{cookiecutter.package_name}}/{{cookiecutter.package_name}}.py

@@ -4,7 +4,7 @@
 from django.utils import translation
 from xblock.core import XBlock
 from xblock.fields import Integer, Scope
-from xblock.fragment import Fragment
+from web_fragments.fragment import Fragment
 from xblockutils.resources import ResourceLoader