Better linting config (#664)

* Better linting config

* Applies isort on django-stubs, only style changes

* Fixes black and isort compat

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ default_language_version:
   python: python3.9
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.3.0
+    rev: v4.0.1
     hooks:
       - id: check-yaml
       - id: trailing-whitespace
@@ -12,20 +12,26 @@ repos:
       - id: debug-statements
       - id: check-merge-conflict
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.7.3
+    rev: v2.20.0
     hooks:
       - id: pyupgrade
         args: ["--py36-plus"]
   - repo: https://github.com/pre-commit/mirrors-isort
-    rev: v5.6.4
+    rev: v5.9.1
     hooks:
       - id: isort
+        name: isort (python)
+        args: ["--profile", "black"]
+      - id: isort
+        name: isort (pyi)
+        types: [pyi]
+        args: ["--profile", "black"]
   - repo: https://github.com/psf/black
-    rev: 20.8b1
+    rev: 21.6b0
     hooks:
       - id: black
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.4
+    rev: 3.9.2
     hooks:
       - id: flake8
   - repo: local