Update dependency pytest-runner to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-runner	==4.2 -> ==6.0.1

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Release Notes

pytest-dev/pytest-runner (pytest-runner)

v6.0.1

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• Updated Trove classifier to indicate this project is inactive.

v6.0.0

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• #​49: Dropped workaround for older setuptools versions.
• Require Python 3.7.

v5.3.2

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• #​58: Fixed syntax issue in changelog.

v5.3.1

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• Refreshed package metadata.

v5.3.0

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• Require Python 3.6 or later.
• Refreshed package metadata.

v5.2

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• #​50: This project is deprecated.

v5.1

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• #​49: Surgically restore support for older setuptools versions.

v5.0

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• #​42: Prefer pyproject.toml

• Refresh package metadata.

• This release now intentionally introduces the changes
  unintionally brought about in 4.5 and 4.3, where the
  adoption of declarative config adds a new requirement
  on setuptools 30.4 or later. On systems running older
  setuptools, installation of pytest-runner via
  easy_install (or setup_requires), will result
  in a DistributionNotFound exception.

  All projects should pin to pytest-runner < 5
  or upgrade the environment to setuptools >= 30.4
  (prior to invoking setup.py).

v4.5.1

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• #​48: Revert changes from 4.5 - restoring project to the
  state at 4.4.

v4.4

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• #​43: Detect condition where declarative config will cause
  errors and emit a UserWarning with guidance on necessary
  actions.

v4.3.1

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• #​43: Re-release of 4.2 to supersede the 4.3 release which
  proved to be backward-incompatible in that it requires
  setuptools 30.4 or possibly later (to install). In the future, a
  backward-incompatible release will re-release these changes.
  For projects including pytest-runner, particularly as
  setup_requires, if support for older setuptools is required,
  please pin to pytest-runner < 5.

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