Remove support for Python 3.9 due to Click 8.2.0

Author: tomwhite

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
         # Use macos-13 because pip binary packages for ARM aren't
         # available for many dependencies
         os: [macos-13, macos-14, ubuntu-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         exclude:
           # Just run macos tests on one Python version
           - os: macos-13
@@ -36,8 +36,6 @@ jobs:
             python-version: "3.11"
           - os: macos-13
             python-version: "3.12"
-          - os: macos-14
-            python-version: "3.9"
           - os: macos-14
             python-version: "3.10"
           - os: macos-14

pyproject.toml

@@ -22,7 +22,7 @@ dependencies = [
   "pyranges!=0.1.3",
   "pyparsing>=3"
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
   "Development Status :: 4 - Beta",
   "License :: OSI Approved :: Apache Software License",
@@ -33,7 +33,6 @@ classifiers = [
   "Intended Audience :: Science/Research",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -66,8 +65,8 @@ addopts = "--cov=vcztools --cov-report=term-missing"
 write_to = "vcztools/_version.py"
 
 [tool.ruff]
-# Assume Python 3.9
-target-version = "py39"
+# Assume Python 3.10
+target-version = "py310"
 
 # Same as Black.
 line-length = 88