Bump flake8-pyi from 20.5.0 to 20.10.0 (#687)

Bumps [flake8-pyi](https://github.com/ambv/flake8-pyi) from 20.5.0 to 20.10.0.
- [Release notes](https://github.com/ambv/flake8-pyi/releases)
- [Commits](PyCQA/flake8-pyi@20.5.0...20.10.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

poetry.lock

@@ -63,7 +63,7 @@ typing-extensions = "^3.7"
 mypy = "^0.790"
 wemake-python-styleguide = "^0.14"
 flake8-pytest-style = "^1.2"
-flake8-pyi = "^20.5"
+flake8-pyi = "^20.10"
 nitpick = "^0.23"
 
 anyio = "^2.0"