refactor: update pre-commit configuration and dependencies for improved Python 3.9 support

pyproject.toml

@@ -11,14 +11,13 @@ authors = [
 description = "PyMC Repeater Daemon"
 readme = "README.md"
 license = {text = "MIT"}
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Operating System :: POSIX :: Linux",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -55,8 +54,7 @@ rrd = [
 dev = [
     "pytest>=7.4.0",
     "pytest-asyncio>=0.21.0",
-    "black>=23.0.0",
-    "isort>=5.12.0",
+    "ruff>=0.11.13",
     "mypy>=1.7.0",
 ]
 
@@ -78,13 +76,12 @@ repeater = [
     "presets/*.yaml",
 ]
 
-[tool.black]
+[tool.ruff]
 line-length = 100
-target-version = ['py38', 'py39', 'py310', 'py311', 'py312']
+target-version = "py39"
 
-[tool.isort]
-profile = "black"
-line_length = 100
+[tool.ruff.lint]
+extend-ignore = ["E701"]
 
 [tool.setuptools_scm]
 version_scheme = "guess-next-dev"