Update dependency pytest-cov to v4 (#15)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pytest-cov](https://github.com/pytest-dev/pytest-cov)
([changelog](https://pytest-cov.readthedocs.io/en/latest/changelog.html))
| `==3.0.0` -> `==4.0.0` |
[![age](https://badges.renovateapi.com/packages/pypi/pytest-cov/4.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/pypi/pytest-cov/4.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/pypi/pytest-cov/4.0.0/compatibility-slim/3.0.0)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/pypi/pytest-cov/4.0.0/confidence-slim/3.0.0)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pytest-dev/pytest-cov</summary>

###
[`v4.0.0`](https://github.com/pytest-dev/pytest-cov/blob/HEAD/CHANGELOG.rst#&#8203;400-2022-09-28)

[Compare
Source](https://github.com/pytest-dev/pytest-cov/compare/v3.0.0...v4.0.0)

**Note that this release drops support for multiprocessing.**

-   `--cov-fail-under` no longer causes `pytest --collect-only` to fail
Contributed by Zac Hatfield-Dodds in `#&#8203;511
<https://github.com/pytest-dev/pytest-cov/pull/511>`\_.
- Dropped support for multiprocessing (mostly because `issue 82408
<https://github.com/python/cpython/issues/82408>`\_). This feature was
mostly working but very broken in certain scenarios and made the test
suite very flaky and slow.

There is builtin multiprocessing support in coverage and you can migrate
to that. All you need is this in your
    `.coveragerc`::

    \[run]
    concurrency = multiprocessing
    parallel = true
    sigterm = true
- Fixed deprecation in `setup.py` by trying to import setuptools before
distutils.
Contributed by Ben Greiner in `#&#8203;545
<https://github.com/pytest-dev/pytest-cov/pull/545>`\_.
- Removed undesirable new lines that were displayed while reporting was
disabled.
Contributed by Delgan in `#&#8203;540
<https://github.com/pytest-dev/pytest-cov/pull/540>`\_.
-   Documentation fixes.
Contributed by Andre Brisco in `#&#8203;543
<https://github.com/pytest-dev/pytest-cov/pull/543>`\_
and Colin O'Dell in `#&#8203;525
<https://github.com/pytest-dev/pytest-cov/pull/525>`\_.
- Added support for LCOV output format via `--cov-report=lcov`. Only
works with coverage 6.3+.
Contributed by Christian Fetzer in `#&#8203;536
<https://github.com/pytest-dev/pytest-cov/issues/536>`\_.
-   Modernized pytest hook implementation.
Contributed by Bruno Oliveira in `#&#8203;549
<https://github.com/pytest-dev/pytest-cov/pull/549>`\_
and Ronny Pfannschmidt in `#&#8203;550
<https://github.com/pytest-dev/pytest-cov/pull/550>`\_.

</details>

---

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---

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requirements.txt

@@ -13,7 +13,7 @@ pydantic==1.10.4
 pylint==2.14.4
 pytest==7.2.1
 pytest-asyncio==0.20.3
-pytest-cov==3.0.0
+pytest-cov==4.0.0
 python-slugify==8.0.0
 PyYAML==6.0
 types-aiofiles==22.1.0.6