HACK: manually install setuptools

Author: molpopgen

.github/workflows/lint.yaml

@@ -21,6 +21,7 @@ jobs:
           pip install -r requirements_lint_CI.txt
           # Mypy also checks types in the tests/ folder
           pip install -r requirements_tests_CI.txt
+          pip install setuptools
           python setup.py build
 
       - name: black