Update dependency flake8 to v3.9.2 (#45)

renovate[bot] · renovate-bot · web-flow · commit 1845f9d3c54d · 2021-06-19T20:24:47.000-07:00
Co-authored-by: Renovate Bot &lt;bot@renovateapp.com&gt;
diff --git a/requirements/lint.txt b/requirements/lint.txt
@@ -1,5 +1,5 @@
 bandit==1.6.2
-flake8==3.8.4
+flake8==3.9.2
 flake8-bugbear==20.11.1
 flake8-comprehensions==3.3.1
 mypy==0.812
