Bump pylint from 2.8.3 to 2.9.3

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.8.3 to 2.9.3.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](pylint-dev/pylint@v2.8.3...v2.9.3)

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

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

pyproject.toml

@@ -27,7 +27,7 @@ pytest = "^6.2"
 black = {version = "^20.8b1",allow-prereleases = true}
 pytest-cov = "^2.11.1"
 jsonschema = "^3.2.0"
-pylint = "^2.7.2"
+pylint = "^2.9.3"
 sphinx = "^3.5.3"
 sphinx-autoapi = "^1.8.1"
 sphinx-rtd-theme = "^0.5.2"