Mark setuptools as explicit build system

Author: progwriter

.github/workflows/reusable-precommit.yml

@@ -37,7 +37,7 @@ jobs:
           python-version: 3.9
       - name: Run checks
         run: |
-          pip install --upgrade pip wheel
+          pip install --upgrade pip wheel types-setuptools
           pip install -e .[dev]
           mypy pybatfish tests
   bf_build:

setup.cfg

@@ -14,6 +14,9 @@
 [aliases]
 test = pytest
 
+[build-system]
+requires = ["setuptools"]
+
 [tool:pytest]
 ;; Unit tests only
 testpaths = tests