add matrix testing for Python 3.9-3.12

Author: msamsami

.github/workflows/tests.yml

@@ -5,14 +5,17 @@ on: [push, pull_request]
 jobs:
   tests:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
         - uses: actions/checkout@v4
 
         - name: Install uv and set the python version
           uses: astral-sh/setup-uv@v5
           with:
-            python-version: "3.11"
+            python-version: ${{ matrix.python-version }}
             enable-cache: true
             cache-dependency-glob: "uv.lock"