update to php 8.3

Author: withinboredom

.github/workflows/unit-tests.yaml

@@ -21,7 +21,7 @@ jobs:
         with:
           coverage: xdebug
           tools: composer
-          php-version: '8.2'
+          php-version: '8.3'
           extensions: mbstring xdebug
 
       - name: Install Dependencies