chore(deps-dev): bump flake8-black from 0.2.1 to 0.2.3 (#541)

Bumps [flake8-black](https://github.com/peterjc/flake8-black) from 0.2.1 to 0.2.3.
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Diff for: poetry.lock

@@ -32,7 +32,7 @@ coverage = {extras = ["toml"], version = "^5.5"}
 pytest = "^6.2.2"
 black = "^20.8b1"
 flake8 = "^3.9.0"
-flake8-black = "^0.2.1"
+flake8-black = "^0.2.3"
 flake8-builtins = "^1.5.3"
 flake8-comprehensions = "^3.4.0"
 flake8-debugger = "^4.0.0"