Extend CI matrix to include macOS and Windows environments

Author: bhimrazy

.github/workflows/ci-testing.yml

@@ -22,11 +22,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-latest"]
+        os: ["ubuntu-latest", "macos-latest", "windows-latest"]
         python-version: ["3.10", "3.11", "3.12"]
         include:
-          - { os: "macos-latest", python-version: "3.12" }
-          - { os: "windows-latest", python-version: "3.11" }
           - { os: "ubuntu-22.04", python-version: "3.10", requires: "oldest" }
 
     timeout-minutes: 35