Require Python 3.9 to run repo2docker

.github/workflows/test.yml

@@ -69,7 +69,7 @@ jobs:
         include:
           # The earliest actions/setup-python versions depend on the runner.
           - ubuntu_version: "22.04"
-            python_version: "3.8"
+            python_version: "3.9"
             repo_type: venv
 
     steps:

.pre-commit-config.yaml

@@ -27,7 +27,6 @@ repos:
     hooks:
       - id: black
         args:
-          - --target-version=py38
           - --target-version=py39
           - --target-version=py310
           - --target-version=py311

README.md

@@ -36,7 +36,7 @@ For more information, please visit
 
 1. Docker to build & run the repositories. The [community edition](https://store.docker.com/search?type=edition&offering=community)
    is recommended.
-2. Python 3.8+.
+2. Python 3.9+.
 
 Supported on Linux and macOS. [See documentation note about Windows support.](http://repo2docker.readthedocs.io/en/latest/install.html#note-about-windows-support)
 

setup.py

@@ -62,7 +62,7 @@ setup(
         "toml",
         "traitlets",
     ],
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     author="Project Jupyter Contributors",
     author_email="jupyter@googlegroups.com",
     url="https://repo2docker.readthedocs.io/en/latest/",