Remove flake8-mypy as it is no longer maintained

Author: marco-c

.pre-commit-config.yaml

@@ -15,7 +15,6 @@ repos:
           - "flake8-coding==1.3.2"
           - "flake8-copyright==0.2.3"
           - "flake8-debugger==4.1.2"
-          - "flake8-mypy==17.8.0"
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.4.0
     hooks: