Add pytest-mock

The `spy` method this package provides is super useful

Author: grahamalama

poetry.lock

@@ -39,6 +39,7 @@ responses = "^0.24.1"
 httpx = "^0.25.2"
 factory-boy = "^3.3.0"
 pytest-factoryboy = "^2.6.0"
+pytest-mock = "^3.12.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]