Bump codecov from 2.1.11 to 2.1.12 (#479)

Bumps [codecov](https://github.com/codecov/codecov-python) from 2.1.11 to 2.1.12.
- [Release notes](https://github.com/codecov/codecov-python/releases)
- [Changelog](https://github.com/codecov/codecov-python/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-python@v2.1.11...v2.1.12)

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

Author: dependabot[bot]

dev-requirements.txt

@@ -4,4 +4,4 @@ pytest==6.2.4
 pytest-asyncio==0.15.1
 pytest-aiohttp==0.3.0
 pytest-cov==2.12.1
-codecov==2.1.11
+codecov==2.1.12