[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/asottile/pyupgrade: v2.7.4 → v2.13.0](asottile/pyupgrade@v2.7.4...v2.13.0)
- [github.com/psf/black: 20.8b1 → 21.4b0](psf/black@20.8b1...21.4b0)
- https://gitlab.com/pycqa/flake8 → https://github.com/PyCQA/flake8
- [github.com/PyCQA/flake8: 3.8.4 → 3.9.1](PyCQA/flake8@3.8.4...3.9.1)
- [github.com/pycqa/isort: 5.7.0 → 5.8.0](PyCQA/isort@5.7.0...5.8.0)
- [github.com/pre-commit/pygrep-hooks: v1.7.0 → v1.8.0](pre-commit/pygrep-hooks@v1.7.0...v1.8.0)

.pre-commit-config.yaml

@@ -1,29 +1,29 @@
 repos:
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.7.4
+    rev: v2.13.0
     hooks:
       - id: pyupgrade
         args: ["--py36-plus"]
 
   - repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: 21.4b0
     hooks:
       - id: black
         args: ["--target-version", "py36"]
 
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+  - repo: https://github.com/PyCQA/flake8
+    rev: 3.9.1
     hooks:
       - id: flake8
         additional_dependencies: [flake8-2020]
 
   - repo: https://github.com/pycqa/isort
-    rev: 5.7.0
+    rev: 5.8.0
     hooks:
       - id: isort
 
   - repo: https://github.com/pre-commit/pygrep-hooks
-    rev: v1.7.0
+    rev: v1.8.0
     hooks:
       - id: python-check-blanket-noqa