Bump pytest from 6.1.2 to 6.2.1 (#18)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.1.2 to 6.2.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.1.2...6.2.1)

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

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

test_requirements.txt

@@ -1,4 +1,4 @@
-pytest==6.1.2
+pytest==6.2.1
 pytest-asyncio==0.14.0
 pytest-testdox==2.0.1
 pytest-randomly==3.5.0