chore: drop Python 3.9 support (require >=3.10) and update CI matrix

Author: Fábio Malcher Miranda

.github/workflows/test-pr.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         os: [ubuntu-latest, macOS-latest, windows-latest]
     steps:
     - uses: actions/checkout@v2

setup.cfg

@@ -14,7 +14,7 @@ exclude = **/__init__.py,  docs/source/conf.py
 ;file.py: error
 
 [requires]
-python_version = ">=3.9,<3.13"
+python_version = ">=3.10,<3.13"
 
 # See the docstring in versioneer.py for instructions. Note that you must
 # re-run 'versioneer.py setup' after changing this section, and commit the

setup.py

@@ -23,7 +23,7 @@
 URL_ISSUES = "https://github.com/scikit-learn-contrib/hiclass/issues"
 EMAIL = "fabio.malchermiranda@hpi.de, Niklas.Koehnecke@student.hpi.uni-potsdam.de"
 AUTHOR = "Fabio Malcher Miranda, Niklas Koehnecke"
-REQUIRES_PYTHON = ">=3.9,<3.13"
+REQUIRES_PYTHON = ">=3.10,<3.13"
 KEYWORDS = ["hierarchical classification"]
 DACS_SOFTWARE = "https://gitlab.com/dacs-hpi"
 # What packages are required for this module to be executed?
@@ -152,7 +152,6 @@ def run(self):
         "Operating System :: Unix",
         "Operating System :: MacOS",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",