Update mypy to 0.981 to support cross-platform development (#63)

Author: perplover

poetry.lock

@@ -55,7 +55,7 @@ bandit = "^1.7.1"
 black = "^22.3.0"
 darglint = "^1.8.1"
 isort = {extras = ["colors"], version = "^5.10.1"}
-mypy = "^0.930"
+mypy = "^0.981"
 mypy-extensions = "^0.4.3"
 pre-commit = "^2.15.0"
 pydocstyle = "^6.1.1"