Bump django in /examples/server/wsgi/django_example

Bumps [django](https://github.com/django/django) from 2.2.13 to 2.2.27.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.13...2.2.27)

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

Signed-off-by: dependabot[bot] <[email protected]>

examples/server/wsgi/django_example/requirements.txt

@@ -1,4 +1,4 @@
-django==2.2.13
+django==2.2.27
 enum-compat==0.0.3
 eventlet==0.30.0
 greenlet==0.4.17