Revert "[skip ci] pip(deps-dev): Bump mypy from 0.910 to 0.960 (#1363)" (#1372)

This reverts commit 84a7694.

Author: malachi-constant

poetry.lock

@@ -55,7 +55,7 @@ isort = "^5.9.2"
 black = "^22.1.0"
 pylint = "^2.11.1"
 flake8 = "^4.0.0"
-mypy = "^0.960"
+mypy = "^0.910"
 pydocstyle = "^6.1.1"
 doc8 = "^0.11.1"
 tox = "^3.24.4"