Bump django-hosts from 5.1 to 6.0 in /requirements

Bumps [django-hosts](https://github.com/jazzband/django-hosts) from 5.1 to 6.0.
- [Changelog](https://github.com/jazzband/django-hosts/blob/master/docs/changelog.rst)
- [Commits](jazzband/django-hosts@5.1...6.0)

---
updated-dependencies:
- dependency-name: django-hosts
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements/common.txt

@@ -1,7 +1,7 @@
 Babel==2.10.1
 django-contact-form==5.0.1
 django-countries==7.6.1
-django-hosts==5.1
+django-hosts==6.0
 django-money==3.1
 django-push @ git+https://github.com/brutasse/django-push.git@22fda99641cfbd2f3075a723d92652a8e38220a5
 django-read-only==1.16.0