Bump django-read-only from 1.16.0 to 1.18.0 in /requirements

Bumps [django-read-only](https://github.com/adamchainz/django-read-only) from 1.16.0 to 1.18.0.
- [Changelog](https://github.com/adamchainz/django-read-only/blob/main/CHANGELOG.rst)
- [Commits](adamchainz/django-read-only@1.16.0...1.18.0)

---
updated-dependencies:
- dependency-name: django-read-only
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/common.txt

@@ -4,7 +4,7 @@ django-countries==7.6.1
 django-hosts==5.1
 django-money==3.5.3
 django-push @ git+https://github.com/brutasse/django-push.git@22fda99641cfbd2f3075a723d92652a8e38220a5
-django-read-only==1.16.0
+django-read-only==1.18.0
 django-recaptcha==4.0.0
 django-registration-redux==2.13
 Django==4.2.16