Fix license config deprecation warnings

They switched to a new format for licenses. See:

https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license

Author: oschwald

pyproject.toml

@@ -11,13 +11,12 @@ authors = [
 ]
 requires-python = ">=3.9"
 readme = "README.rst"
-license = {text = "Apache License, Version 2.0"}
+license = "Apache-2.0"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Environment :: Web Environment",
     "Intended Audience :: Developers",
     "Intended Audience :: System Administrators",
-    "License :: OSI Approved :: Apache Software License",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.9",