Update dependency pytest to v8.4.0

Author: renovate[bot]

requirements-dev.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 
 black==25.1.0
-pytest==8.3.5
+pytest==8.4.0
 mypy==1.15.0
 django-stubs[compatible-mypy]==5.2.0
 djangorestframework-stubs[compatible-mypy]==3.16.0