Drop Python 3.8 support, require Python 3.9+

DEPENDENCIES.txt

@@ -1,4 +1,4 @@
-- python 3.8+
+- python 3.9+
 - setuptools
 - libspatialindex C library 1.8.5+:
   https://libspatialindex.org/

environment.yml

@@ -3,5 +3,5 @@ channels:
 - defaults
 - conda-forge
 dependencies:
-- python>=3.8
+- python>=3.9
 - libspatialindex>=1.8.5

pyproject.toml

@@ -13,7 +13,7 @@ maintainers = [
 ]
 description = "R-Tree spatial index for Python GIS"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 keywords = ["gis", "spatial", "index", "r-tree"]
 license = {text = "MIT"}
 classifiers = [
@@ -23,7 +23,6 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -49,7 +48,7 @@ version = {attr = "rtree.__version__"}
 rtree = ["py.typed"]
 
 [tool.cibuildwheel]
-build = "cp38-*"
+build = "cp39-*"
 build-verbosity = 3
 repair-wheel-command = "python scripts/repair_wheel.py -w {dest_dir} {wheel}"
 test-requires = "tox"

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 requires =
     tox>=4
-env_list = py{38,39,310,311,312}
+env_list = py{39,310,311,312}
 
 [testenv]
 description = run unit tests