chore(ci): remove redundant flake8 and configure ruff explicitly

Ruff already covers flake8's rules, so drop flake8 from the linters
workflow. Add explicit ruff lint rule selection and dev optional
dependencies to pyproject.toml. Fix import order in tests.

Author: fguillot

.github/workflows/linters.yml

@@ -15,8 +15,6 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install ruff flake8
+          pip install ruff
       - name: Run Ruff
         run: ruff check --output-format=github .
-      - name: Run Flake8
-        run: flake8 --max-line-length 120

pyproject.toml

@@ -17,6 +17,9 @@ classifiers = [
     "Programming Language :: Python :: 3 :: Only",
 ]
 
+[project.optional-dependencies]
+dev = ["ruff"]
+
 [project.urls]
 "Homepage" = "https://github.com/kanboard/python-api-client"
 "Bug Reports" = "https://github.com/kanboard/python-api-client/issues"
@@ -25,3 +28,9 @@ classifiers = [
 [build-system]
 requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
+
+[tool.ruff]
+line-length = 120
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I"]

tests/test_kanboard.py

@@ -20,10 +20,10 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
 
-import unittest
-from unittest import mock
 import types
+import unittest
 import warnings
+from unittest import mock
 
 import kanboard