Update minimum version to 3.10

Author: amas0

.github/workflows/main.yml

@@ -44,7 +44,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:

pyproject.toml

@@ -8,7 +8,7 @@ description = "Python interface to CmdStan"
 readme = "README.md"
 license = { text = "BSD-3-Clause" }
 authors = [{ name = "Stan Dev Team" }]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = ["pandas", "numpy>=1.21", "tqdm", "stanio>=0.4.0,<2.0.0"]
 dynamic = ["version"]
 classifiers = [