Update dependency pytest-cov to v2.12.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-cov (changelog)	==2.11.1 -> ==2.12.1

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Release Notes

pytest-dev/pytest-cov

### [`v2.12.1`](https://togithub.com/pytest-dev/pytest-cov/blob/HEAD/CHANGELOG.rst#​2121-2021-06-01) [Compare Source](https://togithub.com/pytest-dev/pytest-cov/compare/v2.12.0...v2.12.1) - 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 `*). Contributed by Sorin Sbarnea in `#​472 `*. - Documented `show_contexts`. Contributed by Brian Rutledge in `#​473 `\_. ### [`v2.12.0`](https://togithub.com/pytest-dev/pytest-cov/blob/HEAD/CHANGELOG.rst#​2120-2021-05-14) [Compare Source](https://togithub.com/pytest-dev/pytest-cov/compare/v2.11.1...v2.12.0) - Added coverage's `toml` extra to install requirements in setup.py. Contributed by Christian Riedel in `#​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 `#​467 `\_. - Fixed *commits since* badge. Contributed by Terence Honles in `#​470 `\_.

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