Bump minimum Python to 3.10; fix gurobipy version constraint

- Drop Python 3.8 and 3.9: gurobipy has no arm64 wheel for 3.8,
  and both are EOL. Minimum is now 3.10.
- Fix gurobipy extra: was capped at <13 but current release is 13.x;
  changed to >=10 with no upper bound.
- Simplify numpy extra: remove 3.8-specific pin (numpy==1.24.*).
- Update CI matrix and classifiers accordingly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: h-g-s

.github/workflows/github-ci.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.11"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "pypy3.11"]
         os: [macos-15, ubuntu-24.04, ubuntu-24.04-arm, windows-2025]
 
     steps:

pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "mip"
 description = "Python tools for Modeling and Solving Mixed-Integer Linear Programs (MIPs)"
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 license = {file = "LICENSE"}
 authors = [
     {name="Tulio A.M. Toffolo", email="tulio@toffolo.com.br"},
@@ -24,8 +24,6 @@ classifiers = [
     "Operating System :: POSIX :: Linux",
     "Operating System :: MacOS",
     "Operating System :: Microsoft :: Windows",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -40,10 +38,9 @@ dependencies = ["cffi>=1.15", "cbcbox>=2.901"]
 
 [project.optional-dependencies]
 numpy = [
-    "numpy>=1.25,<3; python_version>='3.9'",
-    "numpy==1.24.*; python_version=='3.8'",
+    "numpy>=1.25,<3",
 ]
-gurobi = ["gurobipy>=8,<13"]
+gurobi = ["gurobipy>=10"]
 highs = ["highsbox>=1.10.0,<2"]
 test = [
     "pytest>=7.4,<9",