Document latest Python sync req

Author: hynek

.github/workflows/ci.yml

@@ -14,6 +14,7 @@ env:
   TOX_TESTENV_PASSENV: FORCE_COLOR
   PIP_DISABLE_PIP_VERSION_CHECK: "1"
   PIP_NO_PYTHON_VERSION_WARNING: "1"
+  # Keep in sync with .pre-commit-config.yaml/default_language_version/python.
   PYTHON_LATEST: "3.11"
   # avoid warnings about shallow checkout, but also make sure pytest accepts us.
   SETUPTOOLS_SCM_PRETEND_VERSION: "99.9.9"

.pre-commit-config.yaml

@@ -3,6 +3,7 @@ ci:
   autoupdate_schedule: monthly
 
 default_language_version:
+  # Keep in sync with ci.yml/PYTHON_LATEST
   python: python3.11
 
 repos: