build(deps-dev): bump pytest-cov from 3.0.0 to 4.0.0 (#857)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 3.0.0 to 4.0.0.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-cov/compare/v3.0.0...v4.0.0)

---
updated-dependencies:
- dependency-name: pytest-cov
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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pyproject.toml

@@ -72,7 +72,7 @@ python = "<3.8"
 [tool.poetry.dev-dependencies]
 # Testing
 pytest = "^7.1.3"
-pytest-cov = "^3.0.0"
+pytest-cov = "^4.0.0"
 codecov = "^2.1.12"
 pytest-asyncio = "^0.18.3"
 fastapi = ">=0.70.1,<0.86"