build(deps): update django-tastypie requirement from <0.15.0 to <0.16.0

Updates the requirements on [django-tastypie](https://github.com/django-tastypie/django-tastypie) to permit the latest version.
- [Release notes](https://github.com/django-tastypie/django-tastypie/releases)
- [Commits](django-tastypie/django-tastypie@v0.8.1...v0.15.0)

---
updated-dependencies:
- dependency-name: django-tastypie
  dependency-type: direct:production
...

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

requirements.txt

@@ -41,7 +41,7 @@ django-treebeard==4.7.1
 django-guardian<2.4.1
 django-downloadview==2.3.0
 django-polymorphic==3.1.0
-django-tastypie<0.15.0
+django-tastypie<0.16.0
 django-tinymce==3.7.1
 django-grappelli==3.0.8
 django-uuid-upload-path==1.0.0