Bump coverage from 6.2 to 6.3

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.2 to 6.3.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@6.2...6.3)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -44,7 +44,7 @@ wheel = "0.36.2"
 watchdog = "2.1.6"
 flake8 = "4.0.1"
 tox = "3.24.5"
-coverage = "6.2"
+coverage = "6.3"
 twine = "3.7.1"
 pytest = "6.2.5"
 pytest-cov = "3.0.0"