Bump pydocstyle from 5.1.0 to 5.1.1

Bumps [pydocstyle](https://github.com/PyCQA/pydocstyle) from 5.1.0 to 5.1.1.
- [Release notes](https://github.com/PyCQA/pydocstyle/releases)
- [Changelog](https://github.com/PyCQA/pydocstyle/blob/master/docs/release_notes.rst)
- [Commits](PyCQA/pydocstyle@5.1.0...5.1.1)

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

requirements-lint.txt

@@ -1,6 +1,6 @@
 # linters
 pycodestyle==2.6.0
-pydocstyle==5.1.0
+pydocstyle==5.1.1
 pylint==2.6.0
 pygments
 pyroma==2.6