pre-commit: update flake8 and mypy version

.pre-commit-config.yaml

@@ -4,12 +4,12 @@ repos:
     hooks:
       - id: black
         args: ['--line-length', '140']
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.4.0
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.2
     hooks:
       - id: flake8
         args: ['--max-line-length=140', '--ignore=E203,E402']
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: 'v0.720'
+    rev: v0.770
     hooks:
     -   id: mypy