chore(deps): update dependency pytest-cov to ==2.12.*

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-cov (changelog)	==2.11.* -> ==2.12.*

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Release Notes

pytest-dev/pytest-cov (pytest-cov)

v2.12.1

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• Changed the toml requirement to be always be directly required (instead of being required through a coverage extra).
  This fixes issues with pip-compile (pip-tools#1300 <https://github.com/jazzband/pip-tools/issues/1300>).
  Contributed by Sorin Sbarnea in #&#8203;472 <https://github.com/pytest-dev/pytest-cov/pull/472>.
• Documented show_contexts.
  Contributed by Brian Rutledge in #&#8203;473 <https://github.com/pytest-dev/pytest-cov/pull/473>_.

v2.12.0

Compare Source

• Added coverage's toml extra to install requirements in setup.py.
  Contributed by Christian Riedel in #&#8203;410 <https://github.com/pytest-dev/pytest-cov/pull/410>_.
• Fixed pytest_cov.__version__ to have the right value (string with version instead of a string
  including __version__ =).
• Fixed license classifier in setup.py.
  Contributed by Chris Sreesangkom in #&#8203;467 <https://github.com/pytest-dev/pytest-cov/pull/467>_.
• Fixed commits since badge.
  Contributed by Terence Honles in #&#8203;470 <https://github.com/pytest-dev/pytest-cov/pull/470>_.

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