Fix flake8 errors

setup.cfg

@@ -1,5 +1,5 @@
 [flake8]
-ignore = E501,W503
+ignore = E501,W503,E741
 application-import-names = cibuildwheel
 exclude =
   cibuildwheel/resources/,

test/template_projects/base.py

@@ -1,5 +1,4 @@
 import os
-import io
 import jinja2
 from typing import Union, Dict, Any
 

test/test_environment.py

@@ -47,7 +47,9 @@ def test(tmp_path):
 def test_overridden_path(tmp_path):
     project_dir = tmp_path / 'project'
     output_dir = tmp_path / 'output'
-    new_c_project().generate(project_dir)
+
+    project = template_projects.new_c_project()
+    project.generate(project_dir)
     output_dir.mkdir()
 
     # mess up PATH, somehow