Update faker from 8.11.0 to 8.12.1

Author: pyup-bot

requirements/requirements-testing.txt

@@ -1,6 +1,6 @@
 django-debug-toolbar==3.2.2
 factory-boy==3.2.0
-Faker==8.11.0
+Faker==8.12.1
 pytest==6.2.4
 pytest-cov==2.12.1
 pytest-django==4.4.0