[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/pre-commit/pre-commit-hooks: v3.4.0 → v4.0.1](pre-commit/pre-commit-hooks@v3.4.0...v4.0.1)
- [github.com/PyCQA/flake8: 3.9.0 → 3.9.2](PyCQA/flake8@3.9.0...3.9.2)
- [github.com/psf/black: 20.8b1 → 21.5b1](psf/black@20.8b1...21.5b1)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ default_language_version:
 
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.4.0
+    rev: v4.0.1
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
@@ -21,7 +21,7 @@ repos:
     -   id: isort
 
 -   repo: https://github.com/PyCQA/flake8
-    rev: 3.9.0
+    rev: 3.9.2
     hooks:
     - id: flake8
 
@@ -31,7 +31,7 @@ repos:
     -   id: mypy
 
 -   repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: 21.5b1
     hooks:
     - id: black
       language_version: python3.8