Bump coverage from 6.3.3 to 6.4 (#309)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.3.3 to 6.4.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@6.3.3...6.4)

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

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

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

pyproject.toml

@@ -33,7 +33,7 @@ black = "^22.3.0"
 isort = "^5.10.1"
 flake8 = "^4.0.1"
 pre-commit = "^2.19.0"
-coverage = "^6.3.3"
+coverage = "^6.4"
 nbmake = "^1.3.0"
 
 [tool.poetry.urls]