update github-action to look for black version in "dependency-groups"

CHANGES.md

@@ -49,6 +49,8 @@
 <!-- For example, Docker, GitHub Actions, pre-commit, editors -->
 
 - Fix the version check in the vim file to reject Python 3.8 (#4567)
+- Enhance GitHub Action `psf/black` to read Black version from an additional
+  section in pyproject.toml: `[project.dependency-groups]` (#4606)
 
 ### Documentation
 

action/main.py

@@ -71,6 +71,7 @@ def read_version_specifier_from_pyproject() -> str:
         return f"=={version}"
 
     arrays = [
+        *pyproject.get("dependency-groups", {}).values(),
         pyproject.get("project", {}).get("dependencies"),
         *pyproject.get("project", {}).get("optional-dependencies", {}).values(),
     ]

docs/integrations/github_actions.md

@@ -37,10 +37,10 @@ the `pyproject.toml` file. `version` can be any
 [valid version specifier](https://packaging.python.org/en/latest/glossary/#term-Version-Specifier)
 or just the version number if you want an exact version. To read the version from the
 `pyproject.toml` file instead, set `use_pyproject` to `true`. This will first look into
-the `tool.black.required-version` field, then the `project.dependencies` array and
-finally the `project.optional-dependencies` table. The action defaults to the latest
-release available on PyPI. Only versions available from PyPI are supported, so no commit
-SHAs or branch names.
+the `tool.black.required-version` field, then the `dependency-groups` table, then the
+`project.dependencies` array and finally the `project.optional-dependencies` table.
+The action defaults to the latest release available on PyPI. Only versions available
+from PyPI are supported, so no commit SHAs or branch names.
 
 If you want to include Jupyter Notebooks, _Black_ must be installed with the `jupyter`
 extra. Installing the extra and including Jupyter Notebook files can be configured via