Bump django from 2.2.24 to 2.2.27 in /demo

Bumps [django](https://github.com/django/django) from 2.2.24 to 2.2.27. - [Release notes](https://github.com/django/django/releases) - [Commits](django/django@2.2.24...2.2.27) --- updated-dependencies: - dependency-name: django dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

demo/requirements.txt

@@ -1,2 +1,2 @@
-Django==2.2.24
+Django==2.2.27
 git+https://github.com/bsab/django-unifi-portal.git