remove 3.8 support (#1073)

This PR also starts using 3.12 properly in CI

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest, ubuntu-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12-dev"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4
         with:

README.rst

@@ -125,7 +125,7 @@ For a more detailed usage example, `see our documentation
 Installation
 ------------
 
-LibCST requires Python 3.8+ and can be easily installed using most common Python
+LibCST requires Python 3.9+ and can be easily installed using most common Python
 packaging tools. We recommend installing the latest stable release from
 `PyPI <https://pypi.org/project/libcst/>`_ with pip:
 

pyproject.toml

@@ -10,13 +10,12 @@ license = { file = "LICENSE" }
 classifiers = [
     "License :: OSI Approved :: MIT License",
     "Topic :: Software Development :: Libraries",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "typing_extensions>=3.7.4.2",
     "typing_inspect>=0.4.0",