devel/py-pytest-runner: Update version 6.0.0=>6.0.1

• Set EXPIRATION_DATE as the upstream has archived the project with the following notice: pytest-runner depends on deprecated features of setuptools and relies on features that break security mechanisms in pip. For example 'setup_requires' and 'tests_require' bypass pip --require-hashes. See also https://github.com/pypa/setuptools/issues/1684
  
  It is recommended that you:
  • Remove 'pytest-runner' from your setup_requires, preferably removing the setup_requires option.
  • Remove 'pytest' and any other testing requirements from tests_require, preferably removing the tests_requires option.
  • Select a tool to bootstrap and then run tests such as tox.