Add PHP 8.2, 8.3 to unit tests

Author: bsweeney

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       max-parallel: 12
       matrix:
-        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', 8.3']
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2