[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.7.4 → v2.20.0](asottile/pyupgrade@v2.7.4...v2.20.0)
- [github.com/psf/black: 20.8b1 → 21.6b0](psf/black@20.8b1...21.6b0)
- https://gitlab.com/pycqa/flake8 → https://github.com/PyCQA/flake8
- [github.com/PyCQA/flake8: 3.8.4 → 3.9.2](PyCQA/flake8@3.8.4...3.9.2)
- [github.com/pycqa/isort: 5.7.0 → 5.9.1](PyCQA/isort@5.7.0...5.9.1)
- [github.com/pre-commit/pygrep-hooks: v1.7.0 → v1.9.0](pre-commit/pygrep-hooks@v1.7.0...v1.9.0)
- [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/pre-commit/mirrors-prettier: v2.2.1 → v2.3.2](pre-commit/mirrors-prettier@v2.2.1...v2.3.2)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,42 +1,42 @@
 repos:
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.7.4
+    rev: v2.20.0
     hooks:
       - id: pyupgrade
         args: ["--py36-plus"]
 
   - repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: 21.6b0
     hooks:
       - id: black
         args: ["--target-version", "py36"]
 
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+  - repo: https://github.com/PyCQA/flake8
+    rev: 3.9.2
     hooks:
       - id: flake8
         additional_dependencies: [flake8-2020]
 
   - repo: https://github.com/pycqa/isort
-    rev: 5.7.0
+    rev: 5.9.1
     hooks:
       - id: isort
 
   - repo: https://github.com/pre-commit/pygrep-hooks
-    rev: v1.7.0
+    rev: v1.9.0
     hooks:
       - id: python-check-blanket-noqa
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.4.0
+    rev: v4.0.1
     hooks:
       - id: check-merge-conflict
       - id: check-toml
       - id: check-yaml
       - id: mixed-line-ending
 
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v2.2.1
+    rev: v2.3.2
     hooks:
       - id: prettier
         args: [--prose-wrap=always, --print-width=88]