Build(deps): Bump coverage from 5.2.1 to 5.3

Bumps [coverage](https://github.com/nedbat/coveragepy) from 5.2.1 to 5.3.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-5.2.1...coverage-5.3)

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

Author: dependabot-preview[bot]

requirements/ci-wheel.txt

@@ -1,7 +1,7 @@
 -r flake.txt
 -r wheel.txt
 
-coverage==5.2.1
+coverage==5.3
 pytest-cov==2.10.1
 tox==3.20.0