build: replace black and isort with ruff

ruff format keeps black's style at the same line length, and ruff
check covers import sorting plus pycodestyle and pyflakes. Three
comments and a test regex are wrapped to fit 79 columns.

.pre-commit-config.yaml

@@ -1,11 +1,8 @@
 repos:
 
-- repo: https://github.com/pycqa/isort
-  rev: 5.13.2
+- repo: https://github.com/astral-sh/ruff-pre-commit
+  rev: v0.17.1
   hooks:
-  - id: isort
-    additional_dependencies: [toml]
-- repo: https://github.com/psf/black
-  rev: 24.4.2
-  hooks:
-  - id: black
+  - id: ruff-check
+    args: [--fix]
+  - id: ruff-format