Bump pylint from 2.7.4 to 2.9.6

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.7.4 to 2.9.6.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.7.4...v2.9.6)

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

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

Author: dependabot[bot]

poetry.lock

@@ -31,7 +31,7 @@ flake8 = "^3.9.0"
 flake8-bandit = "^2.1.2"
 flake8-bugbear = "^21.4.3"
 placebo = "^0.9.0"
-pylint = "^2.7.4"
+pylint = "^2.9.6"
 pytest-black = "^0.3.12"
 pytest-cov = "^2.11.1"
 pytest-datadir = "^1.3.1"