[PR #9944/69ca7df6 backport][3.11] Use SPDX license expression (#9945)

Co-authored-by: Marc Mueller <[email protected]>

Author: patchback[bot]

setup.cfg

@@ -16,7 +16,7 @@ long_description = file: README.rst
 long_description_content_type = text/x-rst
 maintainer = aiohttp team <[email protected]>
 maintainer_email = [email protected]
-license = Apache 2
+license = Apache-2.0
 license_files = LICENSE.txt
 classifiers =
   Development Status :: 5 - Production/Stable