Automatically update and run pre-commit hooks

Author: github-actions[bot]

.pre-commit-config.yaml

@@ -9,7 +9,7 @@ repos:
 
 # Automatically sort imports with isort
 - repo: https://github.com/timothycrosley/isort.git
-  rev: 5.7.0
+  rev: 5.8.0
   hooks:
   - id: isort
     additional_dependencies: [toml]
@@ -23,7 +23,7 @@ repos:
 
 # Enforce style with Flake8
 - repo: https://gitlab.com/pycqa/flake8
-  rev: 3.8.4
+  rev: 3.9.1
   hooks:
   - id: flake8
     # Exclude docstring checks, ignore E203 (see https://github.com/PyCQA/pycodestyle/issues/373)