pip(deps): update pytest requirement from ~=6.2 to ~=7.0 (#219)

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@6.2.0...7.0.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/DEV_REQUIREMENTS.txt

@@ -6,6 +6,6 @@ isort~=5.10
 moto~=3.0
 pydoc-markdown~=4.3 ; python_version >= '3.7'
 pydoc-markdown~=3.13 ; python_version == '3.6'
-pytest~=6.2
+pytest~=7.0
 pytest-cov~=3.0
 pylint~=2.11