[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

setup.cfg

@@ -8,7 +8,7 @@ url = https://github.com/pypa/cibuildwheel
 author = Joe Rickerby
 author_email = [email protected]
 license = BSD-2-Clause
-license_file = LICENSE
+license_files = LICENSE
 classifiers =
     Development Status :: 5 - Production/Stable
     Intended Audience :: Developers