Tell codespell to skip fixture / fix pre-commit (#1197)

* Tell codespell to skip `fixture`

This will avoid this kind of warnings:
	WARNING: Decoding file using encoding=utf-8 failed: fixture/8/0/11
	WARNING: Trying next encoding iso-8859-1

Seen in:
https://results.pre-commit.ci/run/github/48049137/1666036569.rj425j-vQKyvNbJ0CUHdcQ

* pre-commit: Remove the hard requirement for Python 3.9

Author: DimitriPapadopoulos

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ ci:
   autofix_commit_msg: "style: pre-commit fixes"
 default_stages: [commit, push]
 default_language_version:
-  python: python3.9
+  python: python3
 repos:
   - repo: https://github.com/PyCQA/flake8
     rev: 3.8.2
@@ -18,7 +18,7 @@ repos:
     rev: v2.1.0
     hooks:
       - id: codespell
-        args: ["-L", "ba,ihs,kake,nd,noe,nwo,te"]
+        args: ["-L", "ba,ihs,kake,nd,noe,nwo,te", "-S", "fixture"]
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v2.3.0
     hooks: