Bump minimum tested Ubuntu version to 22.04 and minimum Python version to 3.8

Author: jendrikseipp

.github/workflows/ubuntu.yml

@@ -17,8 +17,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04]
-        python-version: [3.7, 3.8, 3.9, '3.10', '3.11', '3.12', '3.13', '3.14']
+        os: [ubuntu-22.04, ubuntu-24.04]
+        python-version: [3.8, 3.9, '3.10', '3.11', '3.12', '3.13', '3.14']
 
     steps:
     - uses: actions/checkout@v3

pyproject.toml

@@ -3,7 +3,7 @@ name = "pyperplan"
 version = "2.1"
 description = "A lightweight STRIPS planner written in Python."
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 license = "GPL-3.0-or-later"
 keywords = ["classical planning", "STRIPS"]
 authors = [{ name = "Jendrik Seipp", email = "jendrik.seipp@liu.se" }]
@@ -14,7 +14,6 @@ classifiers = [
     "Intended Audience :: Education",
     "Intended Audience :: Science/Research",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",