Bump django from 4.1 to 4.1.13 in /testapps/django/mysite

Bumps [django](https://github.com/django/django) from 4.1 to 4.1.13.
- [Commits](django/django@4.1...4.1.13)

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

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

testapps/django/mysite/requirements.txt

@@ -1,2 +1,2 @@
-Django==4.1
+Django==4.1.13
 mysqlclient