build(deps): bump doc8 from 0.9.0 to 0.9.1 (#628)

Bumps [doc8](https://github.com/pycqa/doc8) from 0.9.0 to 0.9.1.
- [Release notes](https://github.com/pycqa/doc8/releases)
- [Commits](PyCQA/doc8@0.9.0...0.9.1)

---
updated-dependencies:
- dependency-name: doc8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

requirements-test.txt

@@ -6,7 +6,7 @@ codespell==2.1.0
 
 jsonschema==3.2.0
 coverage==5.5
-doc8==0.9.0
+doc8==0.9.1
 
 types-python-dateutil==2.8.0
 types-orjson==3.6.0