feat: Run tests on multiple operating systems

This commit updates the CI/CD workflow to run the test suite on
ubuntu-latest, windows-latest, and macos-latest. This is achieved
by using a matrix strategy in the 'test' job.

Author: google-labs-jules[bot]

.github/workflows/ci-cd.yml

@@ -32,9 +32,10 @@ jobs:
 
   test:
     needs: lint
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
         python-version: ["3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493