expand test matrix to include windows and macos

.github/workflows/test.yml

@@ -44,22 +44,29 @@ jobs:
         run: bash scripts/lint.sh
 
   test:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version:
-          - "3.14"
-          - "3.13"
-          - "3.12"
-          - "3.11"
-          - "3.10"
-          - "3.9"
-          - "3.8"
+        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        python-version: [ "3.14" ]
+        include:
+          - os: macos-latest
+            python-version: "3.8"
+          - os: windows-latest
+            python-version: "3.9"
+          - os: ubuntu-latest
+            python-version: "3.10"
+          - os: macos-latest
+            python-version: "3.11"
+          - os: windows-latest
+            python-version: "3.12"
+          - os: ubuntu-latest
+            python-version: "3.13"
         pydantic-version: ["pydantic-v1", "pydantic-v2"]
         exclude:
           - python-version: "3.14"
             pydantic-version: "pydantic-v1"
       fail-fast: false
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Dump GitHub context
         env: