Bump django-markupfield from 1.4.3 to 1.5.1

Bumps [django-markupfield](https://github.com/jamesturk/django-markupfield) from 1.4.3 to 1.5.1.
- [Release notes](https://github.com/jamesturk/django-markupfield/releases)
- [Changelog](https://github.com/jamesturk/django-markupfield/blob/master/CHANGELOG.md)
- [Commits](jamesturk/django-markupfield@1.4.3...1.5.1)

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

Author: dependabot-preview[bot]

base-requirements.txt

@@ -27,7 +27,7 @@ python-dateutil==2.6.1
 requests[security]>=2.20.0
 
 django-honeypot==0.6.0
-django-markupfield==1.4.3
+django-markupfield==1.5.1
 
 django-allauth==0.36.0