chore(deps): bump flake8-docstrings in /dev_requirements (aws#555)

Bumps [flake8-docstrings](https://github.com/pycqa/flake8-docstrings) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/pycqa/flake8-docstrings/releases)
- [Changelog](https://github.com/PyCQA/flake8-docstrings/blob/main/HISTORY.rst)
- [Commits](PyCQA/flake8-docstrings@1.6.0...1.7.0)

---
updated-dependencies:
- dependency-name: flake8-docstrings
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

dev_requirements/linter-requirements.txt

@@ -3,7 +3,7 @@ black==22.3.0
 doc8==0.10.1
 flake8==4.0.1
 flake8-bugbear==22.9.11
-flake8-docstrings==1.6.0
+flake8-docstrings==1.7.0
 flake8-print==5.0.0
 isort==5.11.4
 pyflakes==2.4.0