⬆️ Update pytest requirement from ^5.4.1 to ^7.0.1

Updates the requirements on [pytest](https://github.com/pytest-dev/pytest) to permit the latest version.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.4.1...7.0.1)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
...

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

pyproject.toml

@@ -8,7 +8,7 @@ license = "MIT"
 [tool.poetry.dependencies]
 python = "^3.6"
 docker = "^5.0.3"
-pytest = "^5.4.1"
+pytest = "^7.0.1"
 
 [tool.poetry.dev-dependencies]
 black = "^19.10b0"