Bump asgiref from 3.3.1 to 3.3.4

Bumps [asgiref](https://github.com/django/asgiref) from 3.3.1 to 3.3.4.
- [Release notes](https://github.com/django/asgiref/releases)
- [Changelog](https://github.com/django/asgiref/blob/main/CHANGELOG.txt)
- [Commits](https://github.com/django/asgiref/compare/3.3.1...3.3.4)

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

requirements.txt

@@ -1,4 +1,4 @@
-asgiref==3.3.1
+asgiref==3.3.4
 Django==3.1.7
 pytz==2021.1
 sqlparse==0.4.1