Update pre-commit configuration

Author: nickmoreton

.gitignore

@@ -7,3 +7,4 @@ dist/
 .python-version
 .coverage
 .venv
+venv

.pre-commit-config.yaml

@@ -1,21 +1,21 @@
+default_language_version:
+  node: system
+  python: python3.9
 repos:
   - repo: https://github.com/python/black
     rev: 22.3.0
     hooks:
       - id: black
-        language_version: python3.8
         exclude: migrations/
   - repo: https://github.com/timothycrosley/isort
     rev: 5.12.0
     hooks:
       - id: isort
-        language_version: python3.8
   - repo: https://github.com/pycqa/flake8
     # flake8 config is in setup.cfg
     rev: 6.0.0
     hooks:
       - id: flake8
-        language_version: python3.8
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v2.3.2
     hooks: