fix: integration tests target in makefile

Makefile

@@ -27,7 +27,6 @@ requirements: ## install environment requirements
 
 install-dev-dependencies: ## install tox
 	pip install -r requirements/tox.txt
-	pip install -r requirements/test.txt
 
 upgrade: export CUSTOM_COMPILE_COMMAND=make upgrade
 upgrade: ## update the requirements/*.txt files with the latest packages satisfying requirements/*.in
@@ -42,7 +41,8 @@ upgrade: ## update the requirements/*.txt files with the latest packages satisfy
 	sed '/^[dD]jango==/d;' requirements/test.txt > requirements/test.tmp
 	mv requirements/test.tmp requirements/test.txt
 
-run-integration-tests: install-dev-dependencies
+run-integration-tests:
+	pip install -r requirements/test.txt
 	pytest -rPf ./eox_tenant/test/integration
 
 quality: clean ## check coding style with pycodestyle and pylint