ci: added more os + more Python versions

Author: rpartzsch

.github/workflows/tests.yml

@@ -6,12 +6,15 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10", "3.11"]
+        os: [ubuntu-latest, "macos-latest", "windows-latest"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
+
+    runs-on: ${{matrix.os}}
+
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}