Bump pytest from 6.2.2 to 6.2.3 (#157)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.2 to 6.2.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.2...6.2.3)

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

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

requirements_test.txt

@@ -1,4 +1,4 @@
-pytest==6.2.2
+pytest==6.2.3
 pytest-cov==2.11.1
 pytest-timeout==1.4.2
 # tests require sub-dependencies of starlette