ci: add windows and php 8.2

Closes #21

Author: josantonius

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
     name: 'PHPUnit (PHP ${{ matrix.php }} - ${{ matrix.system }})'
     strategy:
       matrix:
-        system: ['ubuntu-latest']
+        system: ['ubuntu-latest', 'windows-latest']
         php:
           - '8.0'
           - '8.1'