Update minimum required Python version to 3.9

.github/workflows/python-package.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4

README.md

@@ -6,7 +6,7 @@
 	<a href="https://doi.org/10.5281/zenodo.10877157"><img title="DOI" alt="DOI" src="https://zenodo.org/badge/DOI/10.5281/zenodo.8029028.svg"></br></a>
   <img title="v0.3" alt="v0.3" src="https://img.shields.io/badge/version-v0.3-informational?color=red"></a>
   <img title="license" alt="license" src="https://img.shields.io/badge/license-MIT-informational?color=red"></a>
-	<img title="python" alt="python" src="https://img.shields.io/badge/python-≥3.8-informational?color=red"></br>
+	<img title="python" alt="python" src="https://img.shields.io/badge/python-≥3.9-informational?color=red"></br>
   <img title="codeql" alt="codeql" src="https://github.com/JustWhit3/QUnfold/actions/workflows/codeql.yml/badge.svg">
   <a href="https://qunfold.readthedocs.io/en/latest/"><img title="docs" alt="docs" src="https://readthedocs.org/projects/qunfold/badge/?version=latest"></a>
   <a href="https://hub.docker.com/r/marcolorusso/qunfold/tags"><img alt="docker build" src="https://img.shields.io/docker/automated/marcolorusso/qunfold"></a>

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "QUnfold"
 version = "0.3.4"
 description = "A quantum-based approach to the distribution unfolding problem"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = {text = "MIT"}
 authors = [
     {name = "Gianluca Bianco", email = "[email protected]"},