Bump asgiref from 3.3.0 to 3.3.1

Bumps [asgiref](https://github.com/django/asgiref) from 3.3.0 to 3.3.1.
- [Release notes](https://github.com/django/asgiref/releases)
- [Changelog](https://github.com/django/asgiref/blob/master/CHANGELOG.txt)
- [Commits](https://github.com/django/asgiref/commits)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,4 +1,4 @@
-asgiref==3.3.0
+asgiref==3.3.1
 Django==3.1.2
 pytz==2020.1
 sqlparse==0.4.1