Update dev dependencies to their latest versions

Due to new isort v5, this slightly changes the formatting in tests.

Author: aloisklink

.pre-commit-config.yaml

@@ -6,25 +6,23 @@ repos:
         exclude: scripts/example.py
 
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.2
+    rev: 3.8.3
     hooks:
       - id: flake8
         exclude: scripts/example.py
 
   - repo: https://github.com/timothycrosley/isort
-    rev: 4.3.21-2
+    rev: 5.3.2
     hooks:
       - id: isort
-        additional_dependencies: [toml]
-        exclude: scripts/example.py
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.770
+    rev: v0.782
     hooks:
     -   id: mypy
 
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v3.1.0
+    rev: v3.2.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer