Remove Windows and Mac CI tests

There is no platform-specific code in this package, so this just slows down
CI with no benefit

.github/workflows/UnitTests.yml

@@ -19,8 +19,6 @@ jobs:
           - x64
         os:
           - ubuntu-latest
-          - windows-latest
-          - macOS-latest
 
     steps:
       - name: Checkout repository