Bump pytest from 6.2.5 to 7.0.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.5 to 7.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.5...7.0.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -41,7 +41,7 @@ black = {version = "^21.9b0", allow-prereleases = true}
 mypy = "^0.931"
 isort = "^5.9.3"
 flake8 = "^4.0.1"
-pytest = "^6.2.5"
+pytest = "^7.0.1"
 pytest-cov = "^3.0.0"
 pre-commit = "^2.17.0"
 trio = "^0.19.0"