chore(isort): replace isort with ruff

This commit replaces `isort` with `ruff`:
- `ruff` hook has been added to pre-commit
- `setup.cfg` configuration disappears in favor of `pyproject.toml`

Note that only `I` rule is selected, other linters (flake8, ...) can be migrated in follow-up steps.

.pre-commit-config.yaml

@@ -37,13 +37,13 @@ repos:
       - id: check-yaml
       - id: mixed-line-ending
 
-  - repo: https://github.com/pycqa/isort
-    rev: 5.13.2
-    hooks:
-      - id: isort
-
   - repo: https://github.com/pre-commit/mirrors-mypy
     rev: v1.14.1
     hooks:
     -   id: mypy
         pass_filenames: false
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.9.3
+    hooks:
+      - id: ruff

pyproject.toml

@@ -20,3 +20,9 @@ omit = [
     "*/pypy/*",
     "*kombu/utils/debug.py",
 ]
+
+[tool.ruff.lint]
+select = ["I"]
+
+[tool.ruff.lint.isort]
+required-imports = ["from __future__ import annotations"]

setup.cfg

@@ -38,10 +38,6 @@ per-file-ignores =
        # docstrings
        D,
 
-[isort]
-add_imports =
-    from __future__ import annotations
-
 [mypy]
 warn_unused_configs = True
 strict = False