Update django-i18nfield requirement from ==1.10.* to ==1.11.* (#5430)

Updates the requirements on [django-i18nfield](https://github.com/raphaelm/django-i18nfield) to permit the latest version.
- [Commits](https://github.com/raphaelm/django-i18nfield/compare/1.10.0...1.11.0)

---
updated-dependencies:
- dependency-name: django-i18nfield
  dependency-version: 1.11.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -44,7 +44,7 @@ dependencies = [
   "django-formtools==2.5.1",
   "django-hierarkey==2.0.*,>=2.0.1",
   "django-hijack==3.7.*",
-  "django-i18nfield==1.10.*",
+  "django-i18nfield==1.11.*",
   "django-libsass==0.9",
   "django-localflavor==5.0",
   "django-markup",