Bump django from 4.1 to 4.1.2 in /example (#429)

Bumps [django](https://github.com/django/django) from 4.1 to 4.1.2.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@4.1...4.1.2)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

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example/requirements.txt

@@ -5,4 +5,4 @@
 
 django-autofixture==0.12.1
 Pillow==6.2.0
-django==4.1
+django==4.1.2