Update flake8-docstrings requirement from ~=1.6 to ~=1.7

Updates the requirements on [flake8-docstrings](https://github.com/pycqa/flake8-docstrings) to permit the latest version.
- [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
...

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

requirements-test.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 asynctest~=0.13
 flake8~=5.0
-flake8-docstrings~=1.6
+flake8-docstrings~=1.7
 mypy==1.0.0
 pylint~=2.15
 pylint-strict-informational==0.1