Bump django-simple-history from 2.8.0 to 2.9.0

Bumps [django-simple-history](https://github.com/treyhunner/django-simple-history) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/treyhunner/django-simple-history/releases)
- [Changelog](https://github.com/treyhunner/django-simple-history/blob/master/CHANGES.rst)
- [Commits](jazzband/django-simple-history@2.8.0...2.9.0)

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

requirements/base.txt

@@ -5,7 +5,7 @@ Django==3.0.5
 django-attachments==1.5
 django-contrib-comments==1.9.2
 django-modern-rpc==0.12.0
-django-simple-history==2.8.0
+django-simple-history==2.9.0
 jira==2.0.0
 Markdown==3.2.1
 python-gitlab==2.2.0