Bump django from 2.2.10 to 2.2.13 (#632)

Bumps [django](https://github.com/django/django) from 2.2.10 to 2.2.13.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@2.2.10...2.2.13)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -17,7 +17,7 @@ cssselect2==0.2.1
 defusedxml==0.6.0
 dicttoxml==1.7.4
 diff-match-patch==20181111
-Django==2.2.10
+Django==2.2.13
 django-appconf==1.0.3
 django-bootstrap-modal-forms==1.5.0
 django-ckeditor==5.7.0