GH Actions: install missing setuptools in the Pylint job

Fixes this Pylint error:

```console
$ pylint $(git ls-files '*.py')
************* Module setup
setup.py:1:0: E0401: Unable to import 'setuptools' (import-error)
```

Author: generalmimon

.github/workflows/check-style.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install pylint
+          pip install pylint setuptools
       - name: Run Pylint
         run: |
           pylint $(git ls-files '*.py')