Bump codecov from 2.1.7 to 2.1.9 (#376)

Bumps [codecov](https://github.com/codecov/codecov-python) from 2.1.7 to 2.1.9.
- [Release notes](https://github.com/codecov/codecov-python/releases)
- [Changelog](https://github.com/codecov/codecov-python/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-python@v2.1.7...v2.1.9)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Mariatta <[email protected]>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -4,4 +4,4 @@ pytest==5.4.3
 pytest-asyncio==0.14.0
 pytest-aiohttp==0.3.0
 pytest-cov==2.10.1
-codecov==2.1.7
+codecov==2.1.9