chore: Update phpunit workflow

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

Author: marcelklehr

.github/workflows/phpunit.yml

@@ -33,9 +33,9 @@ jobs:
       # do not stop on another job's failure
       fail-fast: false
       matrix:
-        php-versions: ['8.1']
+        php-versions: ['8.2']
         databases: ['sqlite']
-        server-versions: ['master', 'stable30']
+        server-versions: ['master', 'stable32', 'stable31', 'stable30']
 
     name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}