Bump coverage from 5.5 to 6.1.2

Bumps [coverage](https://github.com/nedbat/coveragepy) from 5.5 to 6.1.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-5.5...6.1.2)

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

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

pyproject.toml

@@ -30,7 +30,7 @@ dateparser = {version = "^1.0.0", optional = true}
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.5"
-coverage = {extras = ["toml"], version = "^5.5"}
+coverage = {extras = ["toml"], version = "^6.1"}
 safety = "^1.10.3"
 mypy = "^0.910"
 typeguard = "^2.12.1"