fix: Keep the djangorestframework pin in test requirements.

Author: mfarhan943

Makefile

@@ -67,7 +67,6 @@ upgrade: $(COMMON_CONSTRAINTS_TXT)
 	pip-compile --rebuild --upgrade -o requirements/production.txt requirements/production.in
 	# Let tox control the Django version for tests
 	sed -i.tmp '/^[dD]jango==/d' requirements/test.txt
-	sed -i.tmp '/^djangorestframework==/d' requirements/test.txt
 	rm requirements/test.txt.tmp
 	sed -i.tmp '/^[dD]jango==/d' requirements/local.txt
 	rm -rf requirements/local.txt.tmp

requirements/test.txt

@@ -348,6 +348,7 @@ django-waffle==5.0.0
     #   edx-toggles
 django-webpack-loader==3.2.1
     # via -r requirements/base.txt
+djangorestframework==3.16.1
     # via
     #   -r requirements/base.txt
     #   django-config-models