fix: testing instruction in `CONTRIBUTING.md` (#8526)

CONTRIBUTING.md

@@ -314,10 +314,15 @@ For bigger changes, you'll want to create a unit test. Our tests are in the `tes
 We use `pytest` for unit testing. To run all unit tests, run the following in the root dir:
 
 ```bash
-pip install -r data_requirements.txt
 pytest tests
 ```
 
+or
+
+```bash
+make test
+```
+
 ### Creating an Example Notebook
 
 For changes that involve entirely new features, it may be worth adding an example Jupyter notebook to showcase