Small targeted upgrades to bugfix releases mostly. Unsure why dependabot isn't doing these (#10561)

pyproject.toml

@@ -36,7 +36,7 @@ dependencies = [
   "django-guardian~=3.0.3",
   "django-multiselectfield~=1.0.1",
   "django-soft-delete~=1.0.18",
-  "djangorestframework~=3.15",
+  "djangorestframework~=3.16",
   "djangorestframework-guardian~=0.4.0",
   "drf-spectacular~=0.28",
   "drf-spectacular-sidecar~=2025.8.1",