Bump djangorestframework from 3.12.2 to 3.15.2 in /backend_app

Bumps [djangorestframework](https://github.com/encode/django-rest-framework) from 3.12.2 to 3.15.2.
- [Release notes](https://github.com/encode/django-rest-framework/releases)
- [Commits](encode/django-rest-framework@3.12.2...3.15.2)

---
updated-dependencies:
- dependency-name: djangorestframework
  dependency-type: direct:production
...

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

backend_app/requirements.macos.txt

@@ -26,7 +26,7 @@ django-organizations==1.1.2
 django-simple-history==2.12.0
 django-timezone-field==4.0
 django-webpack-loader==0.6.0
-djangorestframework==3.12.2
+djangorestframework==3.15.2
 djangorestframework-simplejwt==4.4.0
 drf-yasg==1.20.0
 future==0.18.2
@@ -110,7 +110,7 @@ django-auth-adfs==1.9.5
 # django-simple-history==2.12.0
 # django-timezone-field==4.0
 # django-webpack-loader==0.6.0
-# djangorestframework==3.12.2
+# djangorestframework==3.15.2
 # # djangorestframework-simplejwt==4.4.0
 # djangorestframework-simplejwt==4.6.0
 # drf-yasg==1.20.0

backend_app/requirements.txt

@@ -24,7 +24,7 @@ django-organizations==1.1.2
 django-simple-history==2.12.0
 django-timezone-field==4.0
 django-webpack-loader==0.6.0
-djangorestframework==3.12.2
+djangorestframework==3.15.2
 djangorestframework-simplejwt==4.4.0
 # djangorestframework-simplejwt==4.6.0
 drf-yasg==1.20.0