Also run tests on php 8.2 and php 8.3

Author: rosier

.github/workflows/tests.yaml

@@ -24,7 +24,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: ['ubuntu-latest']
-                php-version: ['8.1']
+                php-version: ['8.1', '8.2', '8.3']
                 include:
                     - operating-system: 'macos-latest'
                       php-version: '8.1'