Test on all OSs

This adds Windows and MacOS to our CI test matrix.

Author: Swatinem

.github/workflows/ci.yml

@@ -70,16 +70,12 @@ jobs:
           codecovcli create-report -t ${{ secrets.CODECOV_TOKEN }} --git-service github
 
   build-test-upload:
-    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - python-version: "3.13"
-          - python-version: "3.12"
-          - python-version: "3.11"
-          - python-version: "3.10"
-          - python-version: "3.9"
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: ["3.13", "3.12", "3.11", "3.10", "3.9"]
+    runs-on: ${{matrix.os}}
     steps:
       - uses: actions/checkout@v4
         with: