update: update pylint requirement from ~=2.13.7 to ~=2.13.8

Updates the requirements on [pylint](https://github.com/PyCQA/pylint) to permit the latest version.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](pylint-dev/pylint@v2.13.7...v2.13.8)

---
updated-dependencies:
- dependency-name: pylint
  dependency-type: direct:development
...

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

requirements_dev.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 aioresponses~=0.7.3
 parsedatetime~=2.6
-pylint~=2.13.7
+pylint~=2.13.8
 pytest-asyncio~=0.18.3
 pytest-cov~=3.0.0
 pytest-mock~=3.7.0