chore: update CI to run on one platform, but multiple python versions (#292)

Author: allenporter

.github/workflows/ci.yml

@@ -36,11 +36,9 @@ jobs:
       matrix:
         python-version:
           - "3.11"
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macOS-latest
-    runs-on: ${{ matrix.os }}
+          - "3.12"
+          - "3.13"
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python